ionic bond

Also found in: Dictionary, Thesaurus, Legal, Financial, Encyclopedia, Wikipedia.


the linkage between atoms or radicals of a chemical compound, or the symbol representing this linkage and indicating the number and attachment of the valencies of an atom in constitutional formulas, represented by a pair of dots or a line between atoms, e.g., H—O—H, H—C≡C—H or H:O:H, H:C:::C:H.
coordinate covalent bond a covalent bond in which one of the bonded atoms furnishes both of the shared electrons.
covalent bond a chemical bond between two atoms or radicals formed by the sharing of a pair (single bond), two pairs (double bond), or three pairs of electrons (triple bond).
disulfide bond a strong covalent bond, —S—S—, important in linking polypeptide chains in proteins, the linkage arising as a result of the oxidation of the sulfhydryl (SH) groups of two molecules of cysteine.
high-energy phosphate bond an energy-rich phosphate linkage present in adenosine triphosphate (ATP), phosphocreatine, and certain other biological molecules. On hydrolysis at pH 7 it yields about 8000 calories per mole, in contrast to the 3000 calories yielded by phosphate esters. The bond stores energy that is used to drive biochemical processes, such as the synthesis of macromolecules, contraction of muscles, and the production of the electrical potentials for nerve conduction.
high-energy sulfur bond an energy-rich sulfur linkage, the most important of which occurs in the acetyl-CoA molecule, the main source of energy in fatty acid biosynthesis.
hydrogen bond a weak, primarily electrostatic, bond between a hydrogen atom bound to a highly electronegative element (such as oxygen or nitrogen) in a given molecule, or part of a molecule, and a second highly electronegative atom in another molecule or in a different part of the same molecule.
ionic bond a chemical bond in which electrons are transferred from one atom to another so that one bears a positive and the other a negative charge, the attraction between these opposite charges forming the bond.
peptide bond the —CO—NH— linkage formed between the carboxyl group of one amino acid and the amino group of another; it is an amide linkage joining amino acids to form peptides.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ion·ic bond

(ī-on'ik bond)
A type of chemical bond that forms between metal and non-metal ions through electrostatic attraction; the attraction between oppositely charged ions.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

ionic bond

an electrostatic bond.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Different molecular forces of protein-protein interactions during heating process contributed to form and maintain the gelation structures, which included ionic bonds, hydrogen bonds and hydrophobic interactions [14].
It promoted the formation of insoluble protein, decreased the amount of ionic bonds, and increased that of nondisulfide covalent bonds and hydrophobic interaction, which would facilitate the formation of gel network structure.
The frequency and success of the group II element is an indication of their effectiveness in the introduction of ionic bonds into either short chain (i.e., nonpolymeric) or long chain (i.e., polymeric) backbones.
The peak that represents removal of water present in the bound state is higher than the boiling point of water as more amount of heat is required to break the ionic bonds that water has made with the polymer [30].
Bifunctional organosilanes, on the other hand, reacts with the methacrylate group of polymers to form covalent and/or ionic bonds. The chemistry and performance of coupling-agent types can best be discussed in terms of specific resin systems since one kind of coupling agent may not be effective on different fillers.
Seeds of grapes belonging to family "Vitis Venifera" are richest source of PA.7,8,11,21 A lot of work has been done and still continuing to assess effect of PA on stability and mechanical properties of dentin and quality of resin-dentin bonded interface.27,32,35 PA interact with proteins by forming hydrogen, covalent or ionic bonds. Association between dentin collagen and PA helps to stabilize the collagen which otherwise does not maintain its triple helix structure in isolated conditions.14
Since the ionic bonds of magnesium and malic acid are easily broken, magnesium malate is also highly soluble.
This could be explained by the lower powder to liquid ratio, resulting in fewer ionic bonds available for matrix formation and, consequently, in greater solubilization of the material.
When large structures are bound together with covalent and ionic bonds they form very hard structures.
Thermoplastic elastomers acquire recovery from reversible 'physical' crosslinks (domains, crystalline regions or ionic bonds), created by close association of the 'hard' parts of the polymer chains.