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Effect of substituents on crystal packing of functionalized 4,4 '-bis(benzylideneamino)diphenyl ether(s) and their reduced benzyl forms: Synthesis, characterization, optical and thermal properties

Authors
  • KADU, R
  • SINGH, VK
  • VERMA, SK
  • RAGHAVAIAH, P
  • SHAIKH, MM
Publication Date
Jan 01, 2013
Identifiers
DOI: 10.1016/j.molstruc.2012.10.041
OAI: oai:dsapce.library.iitb.ac.in:100/15523
Source
DSpace at IIT Bombay
Keywords
Language
English
License
Unknown
External links

Abstract

In this paper we report the synthesis of 4,4'-bis(benzylideneamino)diphenyl ether (1), 4,4'-bis(p-methoxybenzylideneamino)diphenyl ether (2), 4,4'-bis(p-nitrobenzylideneamino)diphenyl ether (3), 4,4'-bis(benzylamino)diphenyl ether (4) and 4,4'-bis(p-methoxybenzylamino)diphenyl ether (5). The new compounds were characterized by using standard spectroscopic techniques. Supramolecular structures of 1-4 have been studied by using single-crystal X-ray diffraction to gauge the influence of substituents, present on para-positions of peripheral phenyl rings, on the association of molecules in the solid state. The study showed that introduction of p-OCH3 and p-NO2 substituents on peripheral phenyl rings, successfully switches off CH center dot center dot center dot pi synthons seen in compound 1 and 4 and that the new compounds adopt other packing strategies based on CH center dot center dot center dot O (2) and CH center dot center dot center dot N, CH center dot center dot center dot O and pi center dot center dot center dot pi (3) interactions. The optical band gaps (Eg), calculated by optical absorption method fall in the range of 2.16-3.0 eV and demonstrate a wide band gap semiconducting nature of these compounds. The thermogravimetric study of these compounds suggests the total destruction of the molecules up to 550 degrees C with a remaining mass of <10%, except the 3. (C) 2012 Elsevier B.V. All rights reserved.

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