A mixed‐valence copper(I/II) coordination polymer directed with a bifunctional soft‐hard pyrazolate−carboxylate ligand

A mixed-valent, one-dimensional Cu(I/II) coordination polymer with the formula [CuII{CuI3(Hmpba)(mpba)2}DMF] ⋅ ∼3DMF was obtained bifunctional ligand 4-(3,5-dimethyl-1H-pyrazol-4-yl)benzoic acid (H2mpba) in N,N-dimethylformamide (DMF) via solvothermal reaction. The compound exhibits a trinuclear {CuI3(Hmpba)(mpba)2}2− metallo-linker softer Cu(I) linearly-coordinated by pyrazolate nitrogen donor atom. This connects harder Cu(II) ions through its carboxylate groups into chain structure. Two form paddlewheel unit and are, thus, surrounded four groups. is five-coordinated terminal DMF ligand. Parallel chains are connected supramolecular layers common R22(8) hydrogen-bond motif of singly-deprotonated carboxyl Hmpba These further organized Cu(I)−Cu(I) interactions 3D array.