Preparation of acentric porous coordination frameworks from an interpenetrated diamondoid array through anion-exchange procedures: Crystal structures and properties

The formation, crystal structures, and properties of a series of three-dimensional (3-D) Cull coordination polymers, {[Cu(L)(2)(H2O)(2)](PF6)(2)(H2O)(1.25)}(n) (1), {[CuL(N-3)(2)](H2O)(1.5)}(n) (2), and {[CuL(H2O)(SO4)](H2O)(2)}(n) (3), with an angular bridging ligand 2,5-bis(4-pyridyl)-1,3,4-oxadiazole (L) are reported. Complex 1 crystallizes in the tetragonal I4(1)/a space group (a = b = 13.462(2) Angstrom, c = 46.47(1) Angstrom, Z = 8), complex 2 in the orthorhombic Pna2(1) space group (a = 6.379(2) Angstrom, b = 10.060(3) Angstrom, c = 27.232(9) Angstrom, Z = 4), and complex 3 in the orthorhombic P2(1)2(1)2(1) space group (a = 5.510(2) Angstrom, b = 10.576(4) Angstrom, c = 28.34(1) Angstrom, Z = 4). Different polymeric frameworks are obtained by only varying the counterions. These include the 2-fold interpenetrated diamondoid structure of 1, the acentric alpha-Po network of 2, and the chiral open framework of 3 with (6(3)). (6(9).8) topology. The interesting anion-exchange, porous, and magnetic properties of these coordination supramolecules have been investigated in detail.