摘要
Using new template agent, a new borophosphate compound, NH4Mn（H2O）2BP2O8·H2O was hydrothermally prepared and structurally characterized. It crystallizes in a hexagonal space group P6 1 22 with lattice parameters a= 0.9652（2） nm, c= 1.5792（5） nm, V= 1.2740（5） nm^3 and Z=6. The structure has a three-dimensional open-frame work with borophosphate helical ribbons ^1∞{ [BP2O8 ]^3-} and MnO4（H2O）2 octahedra. The water molecules are positioned inside the helical channels. Very interestingly, the ammonium ions are located outside the loop of the free helical ribbons via the strong hydrogen bonds, which is different from the borophosphate analogue reported. The magnetization of the title compound is paramagnetic down to 5 K of the Curie-Weiss type within the measured range of 5=-00 K with θ=-7.3 K, indicative of very weak antiferromagnetic interactions. The thermal decomposition of the compound was also described.
Using new template agent, a new borophosphate compound, NH4Mn（H2O）2BP2O8·H2O was hydrothermally prepared and structurally characterized. It crystallizes in a hexagonal space group P6 1 22 with lattice parameters a= 0.9652（2） nm, c= 1.5792（5） nm, V= 1.2740（5） nm^3 and Z=6. The structure has a three-dimensional open-frame work with borophosphate helical ribbons ^1∞{ [BP2O8 ]^3-} and MnO4（H2O）2 octahedra. The water molecules are positioned inside the helical channels. Very interestingly, the ammonium ions are located outside the loop of the free helical ribbons via the strong hydrogen bonds, which is different from the borophosphate analogue reported. The magnetization of the title compound is paramagnetic down to 5 K of the Curie-Weiss type within the measured range of 5=-00 K with θ=-7.3 K, indicative of very weak antiferromagnetic interactions. The thermal decomposition of the compound was also described.
基金
Project supported by the National Natural Science Foundation of China （No. 20273021） and the Key Project of Shanghai Science and Tecnology Committee（No. 05JC 14070）.Dedicated to Professor Xikui Jiang on the occasion of his 80th birthday.
