Linking 1D Transition-Metal Coordination Polymers and Different Inorganic Boron Oxides To Construct a Series of 3D Inorganic–Organic Hybrid Borates

Three inorganic–organic hybrid borates, M­(1,4-dab)­[B₅O₇(OH)₃] [M = Zn (1), Cd (2), 1,4-dab = 1,4-diaminobutane)] and Co­(1,3-dap)­[B₄O₇] (3, 1,3-dap = 1,3-diaminopropane), which integrated characteristics of 1D coordination polymers and 1D/3D inorganic boron oxides have been obtained under solvothermal conditions. Compounds 1 and 2 are isostructural and crystallize in a centrosymmetric space group P2₁/c; the 3D achiral structures of 1 and 2 consist of the nonhelical Zn/Cd-1,4-dap coordination polymers and 1D B–O chains. Compound 3 crystallizes in a chiral space group P4₃2₁2; the helical Co-1,3-dap coordination polymer chains are entrained within a 3D B–O network and finally form the chiral framework. Compounds 1–3 represent good examples of using coordination polymers to construct mixed-motif inorganic–organic hybrid borates. Compounds 1 and 2 display blue luminescence when excited with UV light.