Anion Change as a Tool for Structure Design: Syntheses and Crystal Structures of Copper(I) Trifluoracetate and Tetrafluoroborate with 3-{(2-morpholino-4-oxo-4,5-dihydro-1,3-thiazol- 5-ylidene)methyl-phenoxy}propene

By alternating-current electrochemical synthesis crystals of two new copper(I) coordination compounds of Cu(CF3COO)C17H18N2O3S (I) and {Cu(C17H18N2O3S)2}BF4 (II) composition have been obtained and structurally investigated. In the crystal structure of I the ligand moiety acts as a bridge, being coordinated to one metal center through the C=C-bond of allyl group, and to another Cu atom by nitrogen atom of thiazole ring. Due to such a bridging function dimers of {Cu(CF3COO)C17H18N2O3S}2 composition appear. The trigonal-planar copper atom coordination sphere includes, besides the nitrogen atom and C=C bond, also one oxygen atom from trifluoroacetate anion. In the structure II two nitrogen atoms from thiazole rings of two ligand moieties form linear surrounding of copper atom resulting in a formation of {Cu(C17H18N2O3S)2}+ complex cations. The {BF4}– anion is completely disordered. Mentioned dimers in I and complex cations and {BF4}– anions in II are associated by weak interactions only.