1. New Syntheses and Structural Characterization of NH₃BH₂Cl and (BH₂NH₂)₃ and Thermal Decomposition Behavior of NH₃BH₂Cl.
- Author
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Lingam, Hima K., Wang, Cong, Gallucci, Judith C., Chen, Xuenian, and Shore, Sheldon G.
- Subjects
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CRYSTAL structure , *AMMONIA synthesis , *CHEMICAL decomposition , *THERMAL analysis , *X-ray diffraction , *HYDROGEN bonding , *LOW temperatures , *SINGLE crystals - Abstract
New convenient procedures for the preparation of ammonia monochloroborane (NH₃BH₂Cl) and cyclotriborazane [(BH₂NH₂)₃] are described. Crystal structures have been determined by single-crystal X-ray diffraction. Strong H...Cl...H bifurcated hydrogen bonding and weak N--H...H dihydrogen bonding are observed in the crystal structure of ammonia monochloroborane. When heated at 50 °C or under vacuum, ammonia monochloroborane decomposes to (NH₂BHCl)x, which was characterized by NMR, elemental analysis, and powder X-ray diffraction. Redetermination of the crystal structure of cyclotriborazane at low temperature by single-crystal X-ray diffraction analysis provides accurate hydrogen positions. Similar to ammonia borane, cyclotriborazane shows extensive dihydrogen bonding of N--H‥H and B--H...H bonds with Hδ+‥Hδ+‥ interactions in the range of 2.00--2.34 A. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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