NDLI: Robustness of a thioamide {⋯H–N–CS}<sub>2</sub> synthon: synthesis and the effect of substituents on the formation of layered to cage-like supramolecular networks in coumarin

Content Provider	Royal Society of Chemistry (RSC)
Author	Shafiq, Zahid Ahmad, Hafiz Badaruddin Tahir, Muhammad Nawaz Naseer, Muhammad Moazzam Yaqub, Muhammad Hussain, Mazhar Hameed, Aminah
Copyright Year	2015
Abstract	The applications of thioureas in crystal engineering have increased dramatically over the past few years. However, their analogs namely N-imino thioureas/thiosemicarbazones are largely ignored, despite the fact that these can be more interesting with respect to crystal engineering applications due to the presence of an additional N-imino moiety. Aiming to highlight their importance in crystal engineering/supramolecular chemistry, three structurally related coumarin–thiosemicarbazone hybrids (3a–3c) have been designed, synthesized and crystallographically characterized. All of the compounds showed a general preference for the adoption of the cis, trans conformation around the central thiourea moiety; a conformation which is ideal for the formation of a dimeric hydrogen-bonded R22(8){⋯H–N–CS}2 synthon as the building block. Therefore, this dimeric synthon is observed in all of the compounds, regardless of the formation of layered to cage-like three dimensional supramolecular networks depending on different substituents. The prevalence of the cis, trans conformation and the robustness of the thioamide dimer synthon in thiosemicarbazones indicate its potential use as a design element in crystal engineering.
Starting Page	6052
Ending Page	6061
Page Count	10
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	39
Issue Number	8
Journal	New Journal of Chemistry
DOI	10.1039/c5nj00734h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Crystal engineering Thioamide Conformational isomerism Thiourea Semicarbazone Protein dimer Supramolecular chemistry Synthon
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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