Unusual three-dimensional coordination networks with [WS4Cu6] cluster nodes and α-C3N4topologyElectronic supplementary information (ESI) available: Synthesis of 1and 2, IR, TGA, PXRD and crystallographic details. CCDC reference numbers 699895 and 699896. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/b818381c

Two new 3D frameworks [(WS4Cu6Br4)(timp)8/3(H2O)40/3]n(1) and [(WS4Cu6Br4) (timtz)8/3(H2O)40/3]n(2), containing heptanuclear cluster blocks (one W atom and six Cu atoms) bridged by trigonal ligands timp or timtz (timp = 1-(3,5-di (1H-imidazol-1-yl)phenyl)-1H-imidazole; timtz = 2,4,6-tri(1H-imidazol-1-yl)-1,3,5-triazine), were successfully synthesized. Both compounds were characterized by single-crystal X-ray diffraction, elemental analysis, XRD, IR, TGA. X-ray determination shows that 1and 2can be topologically represented as (3,4)-connected networks with α-C3N4(or ctn) topology where [WS4Cu6] act as the 4-connecting nodes, and the timp or timtz ligands bridge in pairs that act as the three-connecting nodes. Both compounds have the high symmetry of space group I-43d, which is the maximum symmetry for this net topology. The luminescent spectra and N2absorption behaviors for 1and 2have also been investigated. [ABSTRACT FROM AUTHOR]