Novel bimetallic thiocyanate-bridged Cu(II)–Hg(II) compounds—synthesis, X-Ray studies and magnetic properties

Seven novel heterobimetallic Cu/Hg polymers based on thiocyanate bridges have been synthesised and characterised by means of IR, EPR, magnetic measurements and single crystal X-Ray. Three of them, [Cu(pzH)4Hg(SCN)4]n (1) [Cu(indH)4Hg(SCN)4]n (2) and [Cu(ampy)2Hg(SCN)4]n (3), have one-dimensional coordination structure. Two compounds [Cu(pzH)2Hg(SCN)4]n (4) and [Cu(abzimH)Hg(SCN)4]n (5) form two-dimensional nets, whereas the complexes [Cu(pyCN)2Hg(SCN)4]n (6) and [Cu(pyCH(OH)(OMe))2Hg(SCN)4]n (7) are three-dimensional coordination polymers. The chains of 1 are connected by the intermolecular N–H•••N hydrogen bonds to the three dimensional net. In 2 the N–H•••S hydrogen bonds link the polymeric chains to the two dimensional layer extending along crystallographic (0 0 1) plane. The polymeric chains of compound 3 are joined by the intermolecular N–H•••N and N–H•••S hydrogen bonds to the three dimensional net. The polymeric layers of 4 are connected by the intermolecular N–H•••N hydrogen bonds to the three dimensional net. - Graphical abstract: Novel bimetallic thiocyanate-bridged Cu(II)–Hg(II) compound-synthesis,X-Ray studies and magnetic properties. Highlights: ► Novel heterobimetallic Cu/Hg coordination polymers were synthesised. ► The multidimensional structures have been proved by single X-ray analysIs. ► A variation in the crystalline architectures was observed depending on auxiliary ligands. ► Magnetic measurements indicate weak exchange interaction between Cu(II) in the crystal lattices below 10 K.