First‐row transition metal–pyridine (py)–sulfate [(py) x M x x M ](SO 4 4 ) complexes ( M M = Ni, Cu and Zn): crystal field theory in action

摘要

The crystal structures of three first‐row transition metal–pyridine–sulfate complexes, namely catena ‐poly[[tetrakis(pyridine‐κ N )nickel(II)]‐μ‐sulfato‐κ 2 O : O ′], [Ni(SO 4 )(C 5 H 5 N) 4 ] n , (1), di‐μ‐sulfato‐κ 4 O : O ‐bis[tris(pyridine‐κ N )copper(II)], [Cu 2 (SO 4 ) 2 (C 5 H 5 N) 6 ], (2), and catena ‐poly[[tetrakis(pyridine‐κ N )zinc(II)]‐μ‐sulfato‐κ 2 O : O ′‐[bis(pyridine‐κ N )zinc(II)]‐μ‐sulfato‐κ 2 O : O ′], [Zn 2 (SO 4 ) 2 (C 5 H 5 N) 6 ] n , (3), are reported. Ni compound (1) displays a polymeric crystal structure, with infinite chains of Ni II atoms adopting an octahedral N 4 O 2 coordination environment that involves four pyridine ligands and two bridging sulfate ligands. Cu compound (2) features a dimeric molecular structure, with the Cu II atoms possessing square‐pyramidal N 3 O 2 coordination environments that contain three pyridine ligands and two bridging sulfate ligands. Zn compound (3) exhibits a polymeric crystal structure of infinite chains, with two alternating zinc coordination environments, i.e. octahedral N 4 O 2 coordination involving four pyridine ligands and two bridging sulfate ligands, and tetrahedral N 2 O 2 coordination containing two pyridine ligands and two bridging sulfate ligands. The observed coordination environments are consistent with those predicted by crystal field theory.