Synthesis, structure and magnetic properties of a copper molybdate hybrid inorganic/organic solid with a novel 10-connected three-dimensional network topology

Abstract Hydrothermal reaction of CuCl 2 , MoO 3 , and 4,4′-dipyridylketone (4,4′-dpk) afforded green crystals of the mixed metal oxide phase {[Cu 2 (MoO 4 ) 2 (4,4′-dpk)(H 2 O)]·H 2 O} n ( 1 ). According to single-crystal X-ray diffraction, {Cu 2 O 2 } dimers link into 1-D {Cu 2 O 2 (μ-H 2 O)} n chains via bridging aqua ligands. These chains form [Cu 2 (MoO 4 ) 2 (H 2 O)] n slabs via linkage through tetrahedral molybdate anions. In turn, the copper molybdate slabs are pillared through tethering 4,4′-dpk ligands into a 10-connected three-dimensional lattice with an unprecedented 3 12 4 30 5 2 6 topology. Variable temperature magnetic data above 140 K were fit to the Curie–Weiss law, with C  = 0.17 cm 3  K/mol Cu and Θ  = 70 K, indicating likely ferromagnetic coupling within the dinuclear kernels of 1 ; low temperature data points towards the possibility of interdimer antiferromagnetic interactions.