16e- and sub-16e- 18e- configurations 16e- and sub-16e- configurations are are common configurations are common common Coordination Coordination Coordination geometries higher geometries of 6 are geometries of 5 and than 6 relatively common lower are common: common = square planar d8 d6 Ligands, Bonding Types, Charges, and Electron Donor Numbers Ligand Name Bonding Type Formal Electrons Charge Donated Molecular Hydrogen: H2 0 2 M-H -1 2 Hydride: H Hydride: H -1 2 M-X -1 2 Halide: X -1 4 Halide: X  bridging (2 to each M) -1 6 Halide: X 3 bridging (2 to each M) Alkoxide, thiolate: OR, SR M- OR -1 2 or 4 -1 4 Alkoxide, thiolate: OR, SR bridging (2 to  each M) -1 6 Alkoxide, thiolate: OR, SR bridging (2 to 3 each M)
16e- and sub-16e- configurations are common 18e- configurations are common 16e- and sub-16e- configurations are common Coordination geometries higher than 6 relatively common Coordination geometries of 6 are common Coordination geometries of 5 and lower are common: d8 = square planar d6 Ligands, Bonding Types, Charges, and Electron Donor Numbers Ligand Name Bonding Type Formal Charge Electrons Donated Molecular Hydrogen: H2 0 2 Hydride: H M-H -1 2 Hydride: H -1 2 Halide: X M-X -1 2 Halide: X  bridging -1 4 (2 to each M) Halide: X 3 bridging -1 6 (2 to each M) Alkoxide, thiolate: OR, SR M- OR -1 2 or 4 Alkoxide, thiolate: OR, SR  bridging -1 4 (2 to each M) Alkoxide, thiolate: OR, SR 3 bridging -1 6 (2 to each M)
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