coordination chemistry

denticity of the molecules we are required to know, definitions of terms

ligand

lewis base, e- donor

denticity

how many e- pairs a ligand will donate

coordination number

total # of ligand donor atoms (LDA)

coordinate covalent bond

covalent bond with both e- from the same atom

denticity * ligands

cordination #

water denticity

mono

ammonia denticity

mono

chloride denticity

mono

cyanide denticity

mono

bromide denticity

mono

azido denticity

mono

CO denticity

mono

thiocyyanate denticity

mono

hydroxide denticity

mono

nitrite denticity

mono

ethylenediamine (en) denticity

bidentate

oxalate denticity

bidentate

diethylenetramine denticity

tetradentate

triphosphate denticity

tetradentate

EDTA denticity

hexadentate (6)

coordination/ionization isomerism

ligand and counterion swap positions and coordinate spehere

linkage isomer

have ambidentate ligand, swap coordination atom

ambidentate ligands

thiocyanate, nitrite

cis/trans isomers (geometric)(diastereoisomerism)

cis: identical ligands adjacent (90) - segregation

trans: identical ligands opposite (180) - integration

optical (enantiomers)

no plane of symmetry, cannot superimpose mirror images

racemic mixture

1:1 mixture of enantiomers

chelate effect

coordination complexes with polydentate ligands are more stable than those of the same cation/coordination number with monodentate ligands, less reduction in entropy