Two crystal structures of copper(II) complexes and adducts based on the neutral N (1),N (1)-dimethyl-N (2)-(pyridin-2-ylmeth-yl)ethane-1,2-di-amine ligand.

From the reaction of copper(II) chloride dihydrate with N (1),N (1)-dimethyl-N (2)-(pyridin-2-ylmeth-yl)ethane-1,2-di-amine (denoted N^N^N) a new species comprising three distinct complexes crystallized, namely, aqua-chlorido-[N (1),N (1)-dimethyl-N (2)-(pyridin-2-ylmeth-yl)ethane-1,2-di-amine-κ(3) N,N',N'']copper(II)chlorido-[N (1),N (1)-dimethyl-N (2)-(pyridin-2-ylmeth-yl)ethane-1,2-di-amine-κ(3) N,N',N'']copper(II) tetra-chlorido-cuprate(II), [CuCl(C(10)H(17)N(3))(H(2)O)][CuCl(C(10)H(17)N(3))][CuCl(4)] or [Cu(N^N^N)(H(2)O)Cl][Cu(N^N^N)Cl(2)][CuCl(4)], the latter two of which form an adduct. This complex was reacted with ammonium thio-cyanate to form [Cu(N^N^N)(NCS)(2)], which crystallized with two independent mol-ecules and a partial water in the asymmetric unit very similarly to the already reported structure of this compound. Both crystal structures show a rather complex set of inter-molecular inter-actions including hydrogen bonding and what may be described as chalcogen bonding, pnictogen bonding and/or coinage bonding. The mol-ecular structures, intra-molecular inter-actions and packing patterns are discussed in detail and the more unusual ones are set into the context of structures available in the literature.