Synthesis, structure and properties of the first organic amine-templated vanadyl pyrophosphate containing two types of helical chains

The first organic amine templated vanadyl pyrophosphate, [H2N(CH3)2]2VO(P2O7) (1), has been synthesized at a relatively mild temperature (180 °C) under solvothermal conditions without any pyrophosphates. The structural analysis reveals that compound 1 is constructed by two types of helical chains and protonated dimethylamine cations. Two types of helical chains in 1 are connected through Osingle bondVsingle bondO linkages to make a double wave-like [VOP2O7]n chain. Magnetic susceptibility measurement of compound 1 indicates antiferromagnetic interactions between V4 + ions, while the observed SHG efficiency is 0.4 times of urea for 1.