Transition metal chloride complex

Due to a smaller crystal field splitting energy, the homoleptic halide complexes of the first transition series are all high spin.

Homoleptic metal halide complexes are known with several stoichiometries, but the main ones are the hexahalometallates and the tetrahalometallates.

Due to the presence of filled pπ orbitals, halide ligands on transition metals are able to reinforce π-backbonding onto a π-acid.

Some homoleptic complexes of the second row transition metals feature metal-metal bonds.

Hexamminecobalt(III) chloride and Cisplatin (cis-Pt(NH3)2Cl2) are prominent examples of metal-ammine-chlorides.

Octahedral molecular geometry is a common structural motif for homoleptic metal chloride complexes. Examples include MCl 6 (M = Mo, W), [MCl 6 ] − (M = Nb, Ta, Mo, W, Re), [MCl 6 ] 2- (M = Ti Zr, Hf, Mo, Mn, Re, Ir, Pd, Pt), and [MCl 6 ] 3- (M = Ru Os, Rh, Ir).
"Nickel dichloride hexahydrate" consists of the chloride complex trans -[NiCl 2 (H 2 O) 4 plus water of crystallization .