Transition‐Metal Complexes with the Novel Scorpionate Ligand Dihydrobis‐(tetrazolyl)borate: Synthesis and Characterization of Infinite Two‐Dimensional Metal‐Ligand Frameworks and One‐Dimensional Water Substructures

Dihydrobis(tetrazolyl)borate metal compounds of the composition [M(L) 2 {μ‐H 2 B(CHN 4 ) 2 } 2 ] n for M = Mn, Fe, Co, Zn, Cd with L = H 2 O and for M = Cu with L = NH 3 are obtained from metal salts and K[H 2 B(CHN 4 ) 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 H 2 B(CHN 4 )   − 2nitrogen 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.