TRANSITION-METAL COMPLEXES WITH THE NOVEL SCORPIONATE LIGAND DIHYDROBIS-(TETRAZOLYL)BORATE - SYNTHESIS AND CHARACTERIZATION OF INFINITE 2-DIMENSIONAL METAL-LIGAND FRAMEWORKS AND ONE-DIMENSIONAL WATER SUBSTRUCTURES

Dihydrobis(tetrazolyl)borate metal compounds of the composition [M(L)(2){mu-H2B(CHN4)2}(2)], for M = Mn, Fe, Co, Zn, Cd with L = H2O and for M = Cu with L = NH3 are obtained from metal salts and K[H2B(CHN4)(2)]. Single-crystal X-ray studies reveal the formation of two-dimensional rhombic grid sheets through the bridging action of the bis(tetrazolyl)borate ligands. Each metal atom is octahedrally coordinated with two trans L ligands and four H2B(CHN4)2 nitrogen donors. Two additional, hydrogen-bonded water molecules occupy the rhombic openings in the compounds with M = Mn, Fe, Co, Zn, and Cd. The water of crystallization is held in place through hydrogen bonding from the water ligands and to the nitrogen atoms to give a substructure of parallel kinked water chains. Temperature-variable magnetic measurements show a Curie-Weiss behavior for the paramagnetic complexes with M = Mn, Fe, Co, and Cu.