A 3D porous indium(III) coordination polymer involving in situ ligand synthesis
Abstract The hydrothermal reaction of In3+ and 1,2,4 benzenetricarboxylic acid with the presence of piperazine leads to the generation of a novel 3D porous coordination polymer, [H3O][In2(btc)(bdc)(OH)2]*5.5H2O (1) (btc=1,2,4 benzenetricarboxylate, bdc=1,4 benzenedicarboxylate) Compound 1 crystallizes in orthorhombic space group Pbca with a=16.216(7) A, b=13.437(6) A, c=31.277(14) A, and Z=8. It is interesting to find that the in situ decarboxylation reaction of 1,2,4 benzenetricarboxylate (btc) partially transformed into 1,4 benzenedicarboxylate (bdc) occurs. The 16 indium(III) centers were linked by four btc, four bdc and two m2 OH ligands to form a box girder. The adjacent box girders are further connected by the bdc and btc ligands to generate a novel porous metal organic framework containing nanotubular open channel with a cross section of approximately 11.5x11.3 A2. The micropores are occupied by lattice water molecules, and the solvent accessible volume of the unit cell was estimated to be 3658.6 A3, which is approximately 53.7% of the unit cell volume (6815.4 A3)