CHEM 230 Lecture Notes - Coordination Complex, Square Planar Molecular Geometry, Valence Bond Theory

• School: Simon Fraser University
• Department: Chemistry
• Course: CHEM 230
• Professor: Jennifer Warriner

Document Summary

Valence bond [vb] theory : lewis (1916): h2, o2, n2 , heitler & london (1927): application of quantum mechanics. 19: gillespie: valence shell electron-pair repulsion, pauling (1930"s): hybridization of atomic orbitals. Molecular orbital [mo] theory: mulliken & hund (1932): (ii) formation of covalent bonds, electron pair linking two nuclei . From pauli exclusion principle: potential energy graph e(r) of electron interaction, when r nucleus repulsive force , at equilibrium: r ro (= 0. 74 in h2, formation of molecules , for two es. Bond energy eb: energy needed to break a bond, eb = hdiss = - hf (standard state, 1 mol, eb stronger bonding . Bond lengths lb and covalent radii: interatomic (nucleus) distance lb = ra + rb, ra , rb covalent atomic radius, smaller lb high attractive energy . Bond angle: angle between the bonds , h2o: co2: Bond polarity: polarity non-symmetric distribution of charges. 21: origin: difference in electronegativity , higher (excess) ve charges;