Extended network via hydrogen bond linkages of zig-zag co-ordination chains [{Cu2(trans-oxen)(μ-OH)(μ-H2O)}n]n+ or [Cu2(trans-oxen)(μ-OCN)2]n [H2oxen = N,N′-bis(2-aminoethyl)oxamide

Abstract

The trans-oxamidato-bridged polymeric complexes [Cu2(trans-oxen)(µ-OH)(µ-H2O)]nBrn·2nH2O 1 and [Cu2(trans-oxen)(µ-OCN)2]n·nH2O 2 [H2oxen = N,N′-bis(2-aminoethyl)oxamide] with zig-zag co-ordination chains were synthesized and characterized by single-crystal X-ray diffraction methods. The cationic chains [{Cu2(trans-oxen)(µ-OH)(µ-H2O)}n]n+ in 1 bridged alternately by trans-oxamidate, µ-OH and µ-H2O arranged in three directions intersect with one another to yield an extended network via the interchain hydrogen bonds formed by metal-co-ordinated OH– and H2O and the solvate water molecules with the linkages Cu–OH· · ·OH–Cu and Cu–H2O· · ·H2O· · ·H2O–Cu. The neutral chains [Cu2(trans-oxen)(µ-OCN)2]n in 2 bridged alternately by trans-oxamidate and double cyanate bridges in an asymmetric N-bonded end-on mode are joined together by bridging H2O molecules via the hydrogen bond linkage Cu(oxen)· · ·H2O· · ·(oxen)Cu to produce the extended network structure. The magnetic calculations showed the presence of antiferromagnetic couplings between the copper(II) ions through both the trans-oxamidate and µ-OH or cyanate bridges.