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Your search keyword '"Lingam, Hima K."' showing total 18 results
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18 results on '"Lingam, Hima K."'

2. A simple and efficient way to synthesize unsolvated sodium octahydrotriborate

Author

Zhenguo Huang, Graham King, Xuenian Chen, Hoy, Jason, Teshome Yisgedu, Lingam, Hima K., Shore, Sheldon G., Woodward, Patrick M., and Ji-Cheng Zhao

Subjects
Organoboron compounds -- Structure, Organoboron compounds -- Chemical properties, Sodium compounds -- Chemical properties, Solvation -- Analysis, X-rays -- Diffraction, X-rays -- Usage, Chemistry
Published
2010

9. Structure determination of an amorphous compound AlB4H11

Author

Chen, Xuenian, primary, Zhang, Yongsheng, additional, Wang, Yongli, additional, Zhou, Wei, additional, Knight, Douglas A., additional, Yisgedu, Teshome B., additional, Huang, Zhenguo, additional, Lingam, Hima K., additional, Billet, Beau, additional, Udovic, Terrence J., additional, Brown, Gilbert M., additional, Shore, Sheldon G., additional, Wolverton, Christopher, additional, and Zhao, Ji-Cheng, additional

Published
2012
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15. Intermolecular dihydrogen- and hydrogen-bonding interactions in diammonium closo-decahydrodecaborate sesquihydrate.

Author

Yisgedu, Teshome B., Xuenian Chen, Lingam, Hima K., Zhenguo Huang, Meyers, Edward A., Shore, Sheldon G., and Ji-Cheng Zhao

Subjects
ORGANIC compounds research, HYDROGEN bonding, DIHYDROGEN bonding, CRYSTALS, CRYSTALLOGRAPHY
Abstract

The article discusses a study which reported the sulfur-free synthesis of the dihydrogen-bonded compound (NH4)2B10H101.5H2O (I), and its anhydrous analog (NH4)2B10H10. The research has identified the compound's anhydrous analog (NH4)2B10H10 and their characterization by NMR, IR, single-crystal X-ray diffraction analysis.

Published
2010
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17. The structural characterization of (NH4)2B10H10 and thermal decomposition studies of (NH4)2B10H10 and (NH4)2B12H12

Author

Yisgedu, Teshome B., Huang, Zhenguo, Chen, Xuenian, Lingam, Hima K., King, Graham, Highley, Aaron, Maharrey, Sean, Woodward, Patrick M., Behrens, Richard, Shore, Sheldon G., and Zhao, Ji-Cheng

Subjects
*MOLECULAR structure, *HYDRIDES, *THERMAL analysis, *CHEMICAL decomposition, *X-ray diffraction, *TEMPERATURE effect, *CHEMICAL reduction, *EXOTHERMIC reactions, *CHEMICAL equilibrium
Abstract

Abstract: The structure of (NH4)2B10H10 (1) was determined through powder XRD analysis. The thermal decomposition of 1 and (NH4)2B12H12 (2) was examined between 20 and 1000 °C using STMBMS methods. Between 200 and 400 °C a mixture of NH3 and H2 evolves from both compounds; above 400 °C only H2 evolves. The dihydrogen bonding interaction in 1 is much stronger than that in 2. The stronger dihydrogen bond in 1 resulted in a significant reduction by up to 60 °C, but with a corresponding 25% decrease in the yield of H2 in the lower temperature region and a doubling of the yield of NH3. The decomposition of 1 follows a lower temperature exothermic reaction pathway that yields substantially more NH3 than the higher temperature endothermic pathway of 2. Heating of 1 at 250 °C resulted in partial conversion of B10H10 2− to B12H12 2−. Both 1 and 2 form an insoluble polymeric material after decomposition. The elements of the reaction network that control the release of H2 from the B10H10 2− can be altered by conducting the experiment under conditions in which pressures of NH3 and H2 are either near, or away from, their equilibrium values. [Copyright &y& Elsevier]

Published
2012
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18. A convenient synthesis and a NMR study of the diammoniate of diborane.

Author

Lingam HK, Chen X, Zhao JC, and Shore SG

Abstract

DADB synthesis: The diammoniate of diborane (DADB) was synthesized in a new metathesis reaction between the diammoniate of monochloroborane and potassium borohydride in liquid ammonia. (1)H and (11)B NMR spectra of DADB are reported. The stability in THF was examined by variable-temperature (11)B NMR spectroscopy., (Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Published
2012
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