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以α-18-钨磷酸和二甲胺为原料在乙腈的水溶液中合成了分子组成为[CH_3NH_2CH_3],[CH_3-NHCH_3]_4H_4[P_2W_(18)O_(62)]·H_2O的电荷转移化合物,并用IR、UV光谱等手段进行了表征。结构测定结果表明,化合物的晶体属于单斜晶系,P2_1/n空间群,α=2.306 2(5)nm,b=1.383 1(3) nm,c=2.468 8(5)nm,β=113.95(3)°,V=7.197(2)nm~3,Z=4,R_1=0.052 3。结构分析表明,标题化合物的分子由2个质子化的二甲胺分子、4个二甲胺分子、4个质子、1个水分子和1个杂多阴离子[P_2W_(18)O_(62)]~(6-)组成。IR光谱和X射线单晶衍射结果表明,在固态下,有机给体与杂多阴离子之间存在相互作用;TG-DTA曲线表明,化合物的失重分3步进行;变温红外光谱结果表明,杂多阴离子骨架在500℃左右分解。
The charge-transfer compounds with [CH_3NH_2CH_3], [CH_3-NHCH_3] _4H_4 [P_2W_ (18) O_ (62)] · H_2O were synthesized from α-18-tungstophosphoric acid and dimethylamine in acetonitrile aqueous solution. And characterized by IR, UV spectroscopy and other means. The crystal structure of the compound belongs to the monoclinic space group P2_1 / n, α = 2.306 2 (5) nm, b = 1.383 1 (3) nm, c = 2.468 8 (3) °, V = 7.197 (2) nm ~ 3, Z = 4, R_1 = 0.052 3. Structural analysis shows that the title compound consists of two protonated dimethylamine molecules, four dimethylamine molecules, four protons, one water molecule and one heteropolyanion [P 2 W 18 O 62] ~ (6-) composition. The results of IR and X-ray single crystal diffraction show that there exists interaction between organic donor and heteropolyanion in solid state. The TG-DTA curve shows that the weight loss of compound is in 3 steps. The infrared spectroscopy results show that heteropoly Anionic skeleton decomposition at about 500 ℃.