NH 3CH 2CHCH 3NH 3]][B 8O 11(OH) 4]·H 2O: Synthesis and characterization of the first 1D borate templated by 1,2-diaminopropane

Abstract

A new hydrated borate compound, [NH 3CH 2CHCH 3NH 3]][B 8O 11(OH) 4]·H 2O 1, has been synthesized in the presence of 1,2-diaminopropane acting as a structure-directing agent under mild conditions. Its structure was determined by single crystal X-ray diffraction and further characterized FTIR, elemental analysis, powder X-ray diffraction and thermogravimetric analysis. Compound 1 crystallizes in the monoclinic system, space group P2 1 /c (No. 14), a=10.0787(7) Å, b=8.8482(6) Å, c=19.3097(4) Å, β=91.352(6)°, V=1721.53(2) Å 3, and Z=4. The structure consists of infinite open-branched borate chains constructed from [B 3O 6(OH)] units, onto which the [B 5O 7(OH) 3] groups are grafted. It represents the first example of one-dimensional borate templated by an organic amine. The adjacent borate chains are further linked together by extensive hydrogen bonds to form a 3D supramolecular network. The diprotonated organic amines and guest water molecules are filled in the free space of the hydrogen-bonded network and interact with the inorganic framework by extensive hydrogen bonds.