In-situ Investigation of BBr3/benzene Solution by Fourier Transformation Infrared Spectroscopy

Chemical Research in Chinese Universities ›› 2009, Vol. 25 ›› Issue (5): 733-737.

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In-situ Investigation of BBr₃/benzene Solution by Fourier Transformation Infrared Spectroscopy

YU Li-li¹, GAI Li-gang², CUI De-liang¹* and WANG Qi-long¹

1. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China;
2. School of Chemical Engineering, Shandong Institute of Light Industry, Jinan 250353, P. R. China

Received:2008-09-24 Revised:2008-10-28 Online:2009-09-25 Published:2009-12-07
Contact: CUI De-liang. E-mail: cuidl@sdu.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.50672048) and the Program of Shandong Science & Technology Council, China(No.2006GG2202039).

Abstract

Abstract:

By means of the in-situ Fourier transformation infrared spectroscopy(FTIR), the properties of BBr₃/benzene solution, which is usually used as the reactant and solution to synthesize BN by benzene-thermal method, have been investigated. The results show that there are some side reactions between BBr₃ and benzene: (1) BBr₃ as an electron-deficient molecule reacts with benzene at room temperature; (2) below 100 °C, substitution of Br atom for H atom of benzene(ring―H) dominates in BBr₃/benzene solution; (3) cracking of benzene ring occurs at a temperature above 100 °C; (4) decomposition of benzene molecules and formation of long-chain aliphatic compounds feature the spectra of BBr₃/benzene solution collected at above 160 °C. They are unfavor for BN to form when BBr₃ is excessive in the synthesis of BN by benzene-thermal route. On the basis of the experimental results, a coordination reaction mechanism via a η²-C₆H₆ binding mode in BBr3/benzene solution is suggested.

Key words: In-situ FTIR technique; BBr₃; Benzene; Boron nitride; Reaction mechanism

YU Li-li, GAI Li-gang, CUI De-liang* and WANG Qi-long. In-situ Investigation of BBr₃/benzene Solution by Fourier Transformation Infrared Spectroscopy[J]. Chemical Research in Chinese Universities, 2009, 25(5): 733-737.

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In-situ Investigation of BBr₃/benzene Solution by Fourier Transformation Infrared Spectroscopy

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