Structural investigations and reactivity of cobalt(II)–disulfide compounds

Controlling the bio-inspired redox conversion of Co(II)–disulfide compounds to their related Co(III)–thiolate complexes is a perplexing task as factors triggering this reaction are not fully understood. Three disulfide ligands 2,2?–disulfanediylbis(N,N-bis((3,5–dimethyl-1H–pyrazol–1–yl)methyl)ethan-1-amine) (LmpzSSLmpz), 3,3?-disulfanedylbis(N,N-bis(pyridin-2-ylmethyl)propan-1-amine) (LpSSLp), and 2,2?-disulfanediylbis(N,N-bis(6-methylpyridin-2–ylmethyl)ethan-1–amine) (L3SSL3) with different chain lengths pyrazole or pyridine groups were reacted cobalt(II) salts resulting studied for potential form complexes. Crystal structures [Co2(LmpzSSLmpz)(Br)4] [1Br], [Co2(LmpzSSLmpz)(NCS)4] [1NCS], [Co2(LpSSLp)(NCS)4] [2NCS], [Co2(L3SSL3)(Cl)4] [3Cl] show that generally sulfur donors do coordinate centers, in dinuclear containing two 5-coordinate cobalt centers. However, unique asymmetric structure found [1Br] which one atoms coordinates ions. Thiocyanate–induced formation presence either ligand LmpzSSLmpz LpSSLp evidently unsuccessful, obtained. The 8-quinolinol suggest may take place, but reactions clean.