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Chemical notation
The covalent bond classification (CBC) method, also referred to as LXZ notation, is a way of describing covalent compounds such as organometallic complexes
Covalent bond classification method
Covalent_bond_classification_method
Two-electron chemical bond where both electrons derive from the same atom
coordinate covalent bond, also known as a dative bond, dipolar bond, or coordinate bond is a kind of two-center, two-electron covalent bond in which the
Coordinate_covalent_bond
Chemical bonding involving attraction between ions
ionic compounds. It is one of the main types of bonding, along with covalent bonding and metallic bonding. Ions are atoms (or groups of atoms) with an electrostatic
Ionic_bonding
Chemical bond by sharing of electron pairs
A covalent bond is a chemical bond that involves the sharing of electrons to form electron pairs between atoms. These electron pairs are known as shared
Covalent_bond
the metal. Based on the covalent bond classification method (from where LBN is derived), the equation for determining ligand bond number is as follows:
Ligand_bond_number
Separation of electric charge in a molecule
usually applied to covalent bonds, that is, bonds where the polarity is not complete. To determine the polarity of a covalent bond using numerical means
Chemical_polarity
Intermolecular attraction between a hydrogen donor-and-acceptor pair
In chemistry, a hydrogen bond (H-bond) is a specific type of molecular interaction that exhibits partial covalent character and cannot be described as
Hydrogen_bond
Hypothetical charge of an atom if all its bonds to different atoms were fully ionic
the transition metal); termed a "Z-type" ligand in Green's covalent bond classification method. The caveat originates from the simplifying use of electronegativity
Oxidation_state
sulfide, like water, is a 2-electron L-type ligand in the covalent bond classification method and the usual electron counting rules. An early and well-studied
Transition metal complexes of hydrogen sulfide and hydrosulfide
Transition_metal_complexes_of_hydrogen_sulfide_and_hydrosulfide
Class of chemical compounds
It is classified as an L ligand in the Covalent bond classification method. In the usual electron counting method, it is a two-electron ligand. Imidazole
Transition metal imidazole complex
Transition_metal_imidazole_complex
Type of chemical bond in metals
pairs form a crystal structure with metallic bonding between them. Another example of a metal–metal covalent bond is the mercurous ion (Hg2+ 2). As chemistry
Metallic_bonding
oxides are classified as L ligands in the covalent bond classification method. In the usual electron counting method, they are two-electron ligands. With respect
Transition metal complexes of pyridine-N-oxides and amine oxides
Transition_metal_complexes_of_pyridine-N-oxides_and_amine_oxides
Tendency of an atom to attract a shared pair of electrons
estimate the bond energy, and the sign and magnitude of a bond's chemical polarity, which characterizes a bond along the continuous scale from covalent to ionic
Electronegativity
British chemist (1936–2020)
C. Gibson. Green developed the covalent bond classification (CBC) method in 1995 to describe the ligands and bonding in coordination and organometallic
Malcolm_Green_(chemist)
Study of organic compounds containing metal(s)
letter kappa, κ. Chelating κ2-acetate is an example. The covalent bond classification method identifies three classes of ligands, X, L, and Z; which are
Organometallic_chemistry
It is classified as an X ligand in the Covalent bond classification method. In the usual electron counting method, it is a one-electron ligand. The NCO
Transition metal cyanate complexes
Transition_metal_cyanate_complexes
Polymer material
Covalent adaptable networks (CANs) are a type of polymer material that closely resemble thermosetting polymers (thermosets). However, they are distinguished
Covalent_adaptable_network
Compound of nitrate ligands
bidentate. Unidentate nitrate is classified as X ligand in the Covalent bond classification method. With respect to HSAB theory, it is classified as hard. When
Transition metal nitrate complex
Transition_metal_nitrate_complex
are classified as L-X ligands in the Covalent bond classification method. In the usual electron counting method, they are three-electron ligands. With
Transition metal dithiophosphate complex
Transition_metal_dithiophosphate_complex
Chemical compound
pentadienyl ligand as depicted. Under Green and Parkin's covalent bond classification method, this would yield LX and L2X respectively. Then additionally
Tris(cyclooctatetraene)triiron
Tris(cyclooctatetraene)triiron
Hydroxide is classified as an X ligand in the covalent bond classification method. In the usual electron counting method, it is a one-electron ligand when terminal
Transition metal hydroxide complexes
Transition_metal_hydroxide_complexes
Class of chemical compounds
Ammonia is classified as an L ligand in the Covalent bond classification method. In the usual electron counting method, it is a two-electron ligand. Ammonia
Metal_ammine_complex
Type of inhibitor
Targeted covalent inhibitors (TCIs) or Targeted covalent drugs are rationally designed inhibitors that bind and then bond to their target proteins. These
Targeted_covalent_inhibitors
Chemical bond theory
viewed as simply somewhere along a continuum between idealized covalent bonding and ionic bonding. Lewis acids are diverse and the term is used loosely. Simplest
Lewis_acids_and_bases
sulfur reagents to metal carbyne complexes. According to the Covalent bond classification method, terminal CS is classified as an L ligand, i.e., a charge-neutral
Transition metal thiocarbonyl complex
Transition_metal_thiocarbonyl_complex
Class of coordination compounds containing nitrile ligands (coordinating via N)
ligands in these complexes are often labile. According to the Covalent bond classification method, nitriles are classified as L ligands, i.e., charge-neutral
Transition metal nitrile complexes
Transition_metal_nitrile_complexes
Chemical complexes containing one or more –NO2 ligands
manner. N- and O-bonding NO2− are classified as X ligands in the Covalent bond classification method. In the usual electron counting method, N- and O-bonded
Transition metal nitrite complex
Transition_metal_nitrite_complex
site of amides. Amides are thus L ligands according to the covalent bond classification method, i.e. charge-neutral 2e donors. With respect to HSAB theory
Transition metal carboxamide complex
Transition_metal_carboxamide_complex
Ion or molecule bound to a metal atom
chemistry, ligands are classified according to the "CBC Method" for Covalent Bond Classification, as popularized by M. L. H. Green and "is based on the
Ligand
Tabular arrangement of the chemical elements
thus forms a covalent H2 molecule, and boron forms a giant covalent structure based on icosahedral B12 clusters. In a metal, the bonding and antibonding
Periodic_table
O bidentate amino carboxylates are "L-X" ligands in the Covalent bond classification method. With respect to HSAB theory, N,O bidentate amino carboxylate
Transition metal amino acid complexes
Transition_metal_amino_acid_complexes
Class of organometallic compounds
synthetic organic and organometallic contexts. According to the covalent bond classification method, vinylidenes are neutral L-type ligands donating two electrons
Transition metal vinylidene complex
Transition_metal_vinylidene_complex
Class of chemical compounds
L. H.; Parkin, Gerard (2014-04-28). "Application of the Covalent Bond Classification Method for the Teaching of Inorganic Chemistry". Journal of Chemical
Metal_tetranorbornyl
Class of chemical compounds
Pyridine is classified as L ligand in the covalent bond classification method. In the usual electron counting method, it is a two-electron ligand. With respect
Transition metal pyridine complexes
Transition_metal_pyridine_complexes
Class of chemical compounds
complexes are used in medical imaging. According to the Covalent bond classification method, isocyanides are classified as L ligands, i.e., charge-neutral
Transition metal isocyanide complexes
Transition_metal_isocyanide_complexes
The simplest alkenyl ligand is vinyl. According to the covalent bond classification method, a terminal alkenyl is an anionic X-type ligand. Some alkenyl
Transition metal alkenyl complex
Transition_metal_alkenyl_complex
Arsines are L ligands according to the Covalent bond classification method. In the usual electron counting method, they are two-electron ligands. With respect
Transition metal arsine complexes
Transition_metal_arsine_complexes
are classified as L–X ligands in the Covalent bond classification method. In the usual electron counting method, they are three-electron ligands. With
Transition metal dithiocarbamate complexes
Transition_metal_dithiocarbamate_complexes
Thiolate is classified as an X ligand in the Covalent bond classification method. In the usual electron counting method, it is a one-electron ligand when terminal
Transition metal thiolate complex
Transition_metal_thiolate_complex
Chemical element with atomic number 7 (N)
fact are on the Allen scale.) Following periodic trends, its single-bond covalent radius of 71 pm is smaller than those of boron (84 pm) and carbon (76 pm)
Nitrogen
Chemical element with atomic number 6 (C)
what the carbon is bonded to. In general, covalent radius decreases with lower coordination number and higher bond order. Graphite is much more reactive than
Carbon
Scientific study of matter's behavior and properties
availability of an electron to bond to another atom. The chemical bond can be a covalent bond, an ionic bond, a hydrogen bond or just because of Van der Waals
Chemistry
Formalism used for classifying compounds
between the purely covalent and ionic extremes. Neutral counting assumes each bond is equally split between two atoms. This method begins with locating
Electron_counting
Central atom with four substituents located at the corners of a tetrahedron
bond angle is just 60° (in practice the angle will be larger due to bent bonds), representing a large degree of strain.[citation needed] AXE method Orbital
Tetrahedral molecular geometry
Tetrahedral_molecular_geometry
Measurement of infrared radiation's interaction with matter
advanced statistical methods such as machine learning and deep-neural networks. The potential of this technique for bacteria classification have been demonstrated
Infrared_spectroscopy
Hydrocarbon compound containing one or more C=C bonds
A carbon–carbon double bond consists of a sigma bond and a pi bond. This double bond is stronger than a single covalent bond: 611 kJ/mol vs. 347 kJ/mol
Alkene
In the covalent bond classification method, κ1-carbonate is an X ligand and κ2-carbonate is an X2 ligand. With two metals, the number of bonding modes
Transition metal carbonate and bicarbonate complexes
Transition_metal_carbonate_and_bicarbonate_complexes
Functional group with the chemical structure R–S–S–R′
configuration then resembles that of a chlorine atom. It thus tends to form a covalent bond with another S− center to form S2−2 group, similar to elemental chlorine
Disulfide
Research of materials
with industrial relevance. Many ceramics and glasses exhibit covalent or ionic-covalent bonding with SiO2 (silica) as a fundamental building block. Ceramics
Materials_science
Three-dimensional arrangement of atoms in an amino acid-chain molecule
specific spatial conformations driven by a number of non-covalent interactions, such as hydrogen bonding, ionic interactions, Van der Waals forces, and hydrophobic
Protein_structure
Material with Vickers hardness exceeding 40 gigapascals
atom. The short B-N (1.57 Å) bond is close to the diamond C-C bond length (1.54 Å), that results in strong covalent bonding between atoms in the same fashion
Superhard_material
Hydrocarbon compound containing one or more C≡C bonds
the H–C≡C bond angles are 180°. By virtue of this bond angle, alkynes are rod-like. Correspondingly, cyclic alkynes are rare due to bond strain. As such
Alkyne
Any chemical compound having at least one nitrogen atom
diamond, and silicon carbide and have similar structures: their bonding changes from covalent to partially ionic to metallic as the group is descended. In
Nitrogen_compounds
Chemical compound involving ionic bonding
neutralize the cations). Although chemists classify idealized bond types as being ionic or covalent, the existence of additional types such as hydrogen bonds
Salt_(chemistry)
It is classified as an X ligand in the Covalent bond classification method. In the usual electron counting method, it is a one-electron ligand. The N3 unit
Transition metal azide complex
Transition_metal_azide_complex
Any organic compound having a sulfanyl group (–SH)
the quaternary structure of multi-unit proteins by forming fairly strong covalent bonds between different peptide chains. A physical manifestation of cysteine-cystine
Thiol
Composite materials
Reactions that are employed should have more the character of classical covalent bond formation in solutions. One of the most prominent processes which fulfill
Hybrid_material
Technique used for determining crystal structures and identifying mineral compounds
and non-covalent interactions. The initial studies revealed the typical radii of atoms, and confirmed many theoretical models of chemical bonding, such
X-ray_crystallography
Group of atoms giving a molecule characteristic properties
functional group are linked to each other and to the rest of the molecule by covalent bonds. For repeating units of polymers, functional groups attach to their
Functional_group
Molecule containing main group elements with more than eight valence electrons
expected van der Waals value in A (a weak bond) almost to the expected covalent single bond value in C (a strong bond). Corriu and coworkers performed early
Hypervalent_molecule
Mass of bromine absorbed by 100 grams of a given substance
the Br2 molecule, is deeply colored but does not impart any color it is covalently bound to carbon in organobromides. Thus, a reaction between bromine and
Bromine_number
Organic compound or functional group containing a C=N bond
functional group or organic compound containing a carbon–nitrogen double bond (C=N). The nitrogen atom can be attached to a hydrogen or an organic group
Imine
Type of receptor ligand or drug that blocks a biological response
bind via covalent intermolecular forces. Because there is not enough free energy to break covalent bonds in the local environment, the bond is essentially
Receptor_antagonist
Category of metallic elements
metal-nonmetal border, their crystalline structures tend to show covalent or directional bonding effects, having generally greater complexity or fewer nearest
Post-transition_metal
Class of chemical compounds
(/ˈɡlaɪkoʊˌlɪpɪdz/) are lipids with a carbohydrate attached by a glycosidic (covalent) bond. Their role is to maintain the stability of the cell membrane and to
Glycolipid
Method of measuring the extent of spatial localization of an electron
clear separation between the core and valence electron, and also shows covalent bonds and lone pairs, in what has been called "a faithful visualization
Electron localization function
Electron_localization_function
discrete molecular nature and well-defined internal cavities, formed through covalent bonds between precisely designed organic building blocks. These molecular
Organic_molecular_cages
Peptides that facilitate cellular intake
also been developed. However, those covalent linking methods are limited by the concern that the synthetic covalent bond between CPP and nucleic acid may
Cell-penetrating_peptide
Compact notation for chemical compounds
together, either in covalent bonds, ionic bonds, or various combinations of these types. This is possible if the relevant bonding is easy to show in one
Chemical_formula
Carbon-containing chemical compound
covalent bond; it is unknown whether organometallic compounds form a subset of organic compounds. For example, the evidence of covalent Fe-C bonding in
Organic_compound
Group of chemical compounds derived from alkanes containing one or more halogens
excess electrons it donates them to the carbon, which results in a covalent bond between the two. Thus C–X is broken by heterolytic fission resulting
Haloalkane
Molecule that blocks enzyme activity
chemical bond with the enzyme such that the enzyme is inhibited until the chemical bond is broken. By contrast, reversible inhibitors bind non-covalently and
Enzyme_inhibitor
Regular organic or inorganic structure which supports a regular porous structure
method of gas storage through adsorption. When the substrate and gas interact with each other, the gas molecules can physio-adsorb or covalently bond
Nanoporous_materials
Type of hydrogel
attraction forces drive new bond formation through reconstructive covalent dangling side chain or non-covalent hydrogen bonding. These flesh-like properties
Self-healing_hydrogels
Covalent compound that contains two double bonds
DY-een); also diolefin, /daɪˈoʊləfɪn/ dy-OH-lə-fin) or alkadiene) is a covalent compound that contains two double bonds, usually among carbon atoms. They
Diene
Chemical theory about acids and bases
stable interactions are hard–hard (ionogenic character) and soft–soft (covalent character). An attempt to quantify the 'softness' of a base consists in
HSAB_theory
Fabrication process for joining materials
or covalent. In an ionic bond, an electron separates from one atom and becomes attached to another atom to form oppositely charged ions. Covalent bonding
Welding
Topics referred to by the same term
recognition, the interaction between two or more molecules through non-covalent bonding "The Recognition", a science fiction short story by J. G. Ballard The
Recognition
Aqueous solution of hydrogen chloride
production. Gaseous hydrogen chloride is a molecular compound with a covalent bond between the hydrogen and chlorine atoms. In aqueous solutions dissociation
Hydrochloric_acid
Bioinformatics subfield
visualization, the external shape of the molecule is shown. Sticks: each covalent bond between amino acid atoms is represented as a stick. This type of visualization
Structural_bioinformatics
Layer of material placed over a tooth
Gagliardi L, Sauer J, Yaghi OM. Carbon dioxide capture from open air using covalent organic frameworks. Nature. 2024 Nov;635(8037):96-101. doi: 10.1038/s41586-024-08080-x
Veneer_(dentistry)
Physical interactions and constructions between multiple proteins
Electric fields around proteins. Occurrence of covalent modifications; There are a multitude of methods to detect them. Each of the approaches has its
Protein–protein_interaction
Chemical group (–CH3) derived from methane
of a larger molecule, bonded to the rest of the molecule by a single covalent bond (−CH3), it can be found on its own in any of three forms: methanide
Methyl_group
DNA strand exchange
the recombinase enzyme forms a transient covalent bond to a DNA backbone phosphate. This phosphodiester bond between the hydroxyl group of the nucleophilic
Site-specific_recombination
acetyltransferase Any of a class of transferase enzymes which catalyze the covalent bonding of an acetyl group (–COCH 3) to another compound, protein, or biomolecule
Glossary of cellular and molecular biology (0–L)
Glossary_of_cellular_and_molecular_biology_(0–L)
Type of secondary structure of proteins
of H-bonds. Phase III is typically associated with large-deformation covalent bond stretching. Alpha-helices in proteins may have low-frequency accordion-like
Alpha_helix
Soft water-rich polymer gel
have non-covalent bonds.[citation needed] Chemical hydrogels can result in strong reversible or irreversible gels due to the covalent bonding. Chemical
Hydrogel
Long carbohydrate polymers such as starch, glycogen, cellulose, and chitin
groups are covalently attached to polysaccharides such as hyaluronic acid or chitosan. As thiolated polysaccharides can crosslink via disulfide bond formation
Polysaccharide
Special crystals composed of multiple compounds
cocrystals at the other end. The components interact via non-covalent interactions such as hydrogen bonding, ionic interactions, van der Waals interactions and
Cocrystal
Category of chemical elements
diversity stems from variability in crystallographic structures and bonding arrangements. Covalent nonmetals existing as discrete atoms like xenon, or as small
Nonmetal
Chemical compound
compounds tend to react with electrophiles at nitrogen-1, whereas the more covalent magnesium compounds (indole Grignard reagents) and (especially) zinc complexes
Indole
precursors, and often rely solely on noncovalent interactions rather than covalent bonds. Coordinate bonds are useful in such supramolecular self-assembly
Coordination_cage
Reversible transition in amorphous materials
anisotropy is increased from isotropic metallic to anisotropic metallic to covalent bonding, thus suggesting a relationship between the group number in the periodic
Glass_transition
Form of matter
Coordination complexes are compounds where a dative bond keeps the substance together without a covalent or ionic bond. Coordination complexes are distinct substances
Substance_(chemistry)
Field of chemistry
highly covalent, such as sulfur dioxide and iron pentacarbonyl. Many inorganic compounds feature polar covalent bonding, which is a form of bonding intermediate
Inorganic_chemistry
Substance that lowers surface tension
the tertiary amine oxides structural type. Non-ionic surfactants have covalently bonded oxygen-containing hydrophilic groups, which are bonded to hydrophobic
Surfactant
Substance composed of macromolecules with repeating structural units
are the elements of polymer structure that require the breaking of a covalent bond in order to change. Various polymer structures can be produced depending
Polymer
Intermolecular and intramolecular interactions between protein and carbohydrate moieties
activate the binding. Ca2+ binds to the protein and carbohydrate by non covalent bond. Mannose-binding protein (MBP) contains the C-type CRD. Two types mannose-6-phosphate
Protein–carbohydrate interaction
Protein–carbohydrate_interaction
neutron – electron– Bohr model – isotope – chemical bond – ionic bond – ions – covalent bond – hydrogen bond – molecule Water: properties of water – solvent
Outline_of_biology
American scientist and activist (1901–1994)
explored was the relationship between ionic bonding, where electrons are transferred between atoms, and covalent bonding, where electrons are shared between atoms
Linus_Pauling
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