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Synthesis, Structure, Thermal and Magnetic Properties of a New Open‐framework Borophosphate: NH 4 Mn(H 2 O) 2 BP 2 O 8 ·H 2 O †
Author(s) -
Shi HengZhen,
Chang JiaZhong,
TANGBO HeJin,
Ding HanMing,
Shan YongKui
Publication year - 2006
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200690233
Subject(s) - chemistry , crystallography , antiferromagnetism , octahedron , magnetization , paramagnetism , crystal structure , thermal decomposition , hydrothermal synthesis , molecule , ion , hydrothermal circulation , condensed matter physics , physics , organic chemistry , quantum mechanics , seismology , geology , magnetic field
Using new template agent, a new borophosphate compound, NH 4 Mn(H 2 O) 2 BP 2 O 8 ·H 2 O was hydrothermally prepared and structurally characterized. It crystallizes in a hexagonal space group P 6 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 ∞ {[BP 2 O 8 ] 3− and MnO 4 (H 2 O) 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 5–300 K with ⊖ =−7.3 K, indicative of very weak antiferromagnetic interactions. The thermal decomposition of the compound was also described.