Synthesis, crystal structure and characterization of a new layered gallium phosphite Ga(HPO3)F-3 center dot(trans-C6N2H16) with left- and right-handed helical chains

A new 2D layered gallium phosphite Ga(HPO3)F-3 center dot(trans-C6N2H16) 1, possessing left- and right-handed helical chains, has been solvothermally synthesized in the presence of 1,2-diaminocyclohexane (DACH) as a structure-directing agent. The inorganic framework of compound 1 consists of [Ga2O4F6] dimers and HPO3 groups. The dimers are linked up via HPO3 groups to give rise to left- and right-handed helical chains along the b-axis, further these two types of helical chains are alternately connected, with [Ga2O4F6] dimer units functioning as hinges to form a novel 2D layered network in the bc-plane. Interestingly, although a mixture of cis and trans isomers of DACH are used in the synthesis, only the trans isomer is found to direct the formation of compound 1. Moreover, the chirality of the racemic trans isomers of DACH can be transferred into the inorganic framework by hydrogen-bond. The crystal data are as follow: Ga(HPO3)F-3 center dot(trans-C6N2H16); M = 322.91; Monoclinic; P2(1)/c (14); a = 11.2635(5) angstrom; b = 9.8212(5) angstrom; c = 10.1458(3) angstrom; beta = 102.981(2)degrees; Z = 4.