The Ihermal Decomposition Mechanism of Lanthanum Hydroxide Dihydrogen Diphthalate Monohydrate

Chem. J. Chinese Universities ›› 1992, Vol. 13 ›› Issue (11): 1345.

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The Ihermal Decomposition Mechanism of Lanthanum Hydroxide Dihydrogen Diphthalate Monohydrate

SUN Ju-Tang¹, ZHANG Ke-Lu¹, ZHANG Ji-Min¹, QIN Zi-Bin¹, FENG Yi-Li²

1. Department of Chemistry, Wuhan University, Wuhan 430072;
2. Department of Chemistry, Qinghai Edacation College, Xining

Received:1992-01-29 Revised:1992-05-24 Online:1992-11-24 Published:1992-11-24

Abstract

Abstract: The thermal decomposition of lanthanum hydroxide dihydrogen diphthalate monohy-drate, LaOH (C₈H₅O₄)₂·H₂O, was studied by thermogravimetric analysis. The products of thermal decomposition at various stages were characterized by infrared spectrometry,gas chro-matography and mass spectrography.The thermal decomposition of LaOH(C₈H₅O₄)₂·H₂Oproceeded in five stages. LaOH(C₃H₅O₄)₂·H₂O-La₂(C₃H₄O₂)₃-La₄O(CO₃)₃(C₈H₄O₄)₂-La₂O (CO₃)₂ La₂O₂CO₃-La₂O₃,The phthalic anhydride ami 9,10-anthraquinone were formed as the condensates of gas phase products during the first and second stages, respectively.

Key words: Lanthanum complex, 1,2-Bcnzenedicarboxylic acid, Thermal decomposition, Irared spertrum

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SUN Ju-Tang, ZHANG Ke-Lu, ZHANG Ji-Min, QIN Zi-Bin, FENG Yi-Li. The Ihermal Decomposition Mechanism of Lanthanum Hydroxide Dihydrogen Diphthalate Monohydrate[J]. Chem. J. Chinese Universities, 1992, 13(11): 1345.

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The Ihermal Decomposition Mechanism of Lanthanum Hydroxide Dihydrogen Diphthalate Monohydrate

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