Two cyanide-bridged compounds composed of Schiff base–manganese(III) building block with dicyanamido and hexacyanocobaltate(III) as ligands: Crystal structure, thermostability and magnetic property

Abstract

Two new cyanide-bridged compounds, [Mn(L)(μ1,3-N(CN)2)]n (1) and {[Mn2(L)2(H2O)2]K(H2O)2Co(CN)6}n (2). (H2L=N,N′-bis-5-chloro-salicylidene)-1,2-diaminoethane), are synthesized and structurally characterized. Single-crystal X-ray diffraction analysis reveals that compounds 1 and 2 are composed of interesting 1D chain-like structure in which the manganese center is hexa-coordinated in the distorted octahedral geometry. In compound 1, Mn(III) ions are bridged by N(CN)2− ligands with μ1,3 modes, while two CN− groups in Co(CN)63− ligand bridge two Mn(III) ions leading to a heterometallic trinuclear unit in compound 2, several of the units are further connected by the linkage of CN− groups and K(I) ions to form the chain-like structure. TGA results indicate that two compounds possess excellent thermostabilities. Magnetic measurement demonstrates that compounds 1 and 2 perform antiferromagnetic interaction with the coupling parameters (J) of −0.722 and −0.849cm−1, respectively. Magneto-structural correlation has been discussed as well.