Transition metals L2

two coordinate

complexes involve a central metal atom bonded to two ligands, forming linear structure

three coordinate

quadrupole complexes involve a central metal atom bonded to three ligands, typically trigonal planar

four coordinate

complexes involve a central metal atom bonded to four ligands, typically forming a tetrahedral (common first row) or square planar geometry. (90 bond angles common 2nd 3rd row TMs w/ d8 config)

five coordinate

complexes involve a central metal atom bonded to five ligands, often forming a trigonal bipyramidal or square pyramidal geometry.

six coordinate

complexes involve a central metal atom bonded to six ligands, typically forming an octahedral geometry.

ionisation isomers (type of structural)

Same empirical formula but different inner sphere / outer sphere combinations

hydration isomers

Same empirical formula but different inner sphere / outer sphere combinations
involving water exchange

linkage isomer

Same empirical formula but different ways of bonding a ligand to the metal, often involving different donor atoms.

coordination isomers

the anion and cation complexes of a coordination
compound exchange one or more ligands

geometric isomer

the anion and cation complexes of a coordination
compound exchange one or more ligands (cis and transplatin, mer and fac)

tetrahedral complex with chiral centers have enantiomers as non-superimposable

Octahedral bis- and tris-chelate complexes