Publication Type Journal Article
Title Packing polymorphism in 3-amino-2-pyrazinecarboxylate based tin(ii) complexes and their catalytic activity towards cyanosilylation of aldehydes
Authors Anirban Karmakar Susanta Hazra Guilherme M. D. M. Rúbio M. Fátima C. Guedes da Silva Armando J.L. Pombeiro
Groups CCC
Journal NEW JOURNAL OF CHEMISTRY
Year 2018
Month November
Volume 42
Number 21
Pages 17513-17523
Abstract Reactions of 3-amino-2-pyrazinecarboxylic acid (HL) with SnCl2 under different hydrothermal conditions and crystallization processes produced two new mononuclear Sn(ii) compounds (1 and 2) of general formula [Sn(N,O-L)(2)] (L = 3-amino-2-pyrazinecarboxylate), and single crystal X-ray diffraction analysis indicated that they are packing polymorphs, complex 1 crystallizing in the monoclinic C2/c space group whereas 2 in the monoclinic P2(1)/c. The Hirshfeld surface analysis shows that the supramolecular features of both forms are guided by SnO and SnN contacts, as well as by strong N-HO and N-HN hydrogen bonds that differentiate the packing in the two forms. Complex 1 shows a one dimensional hydrogen bonded network whereas 2 shows a 2D hydrogen bonded network. To the best of our knowledge no examples of packing polymorphs based on tin(ii) complexes have been reported so far. These polymorphs are interconvertible when immersed in a suitable solvent or mixture of solvents. They also act as heterogeneous catalysts for the cyanosilylation reaction of aldehydes with trimethylsilyl cyanide (TMSCN) and can be recycled several times without losing activity.
DOI http://dx.doi.org/10.1039/c8nj03805h
ISBN
Publisher
Book Title
ISSN 1144-0546
EISSN 1369-9261
Conference Name
Bibtex ID ISI:000448568100038
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