Synthesis and X-ray crystal structure of isomeric pyridine-based leuco-TAM dyes, 2,2-(2-(pyridinyl)propane-1,3-diylidene)bis(5-chloro-1,3,3-trimethyl indoline) derivatives and unusual stability of 4-pyridinyl compound
- Authors
- Ma, So-Young; Keum, Sam-Rok
- Issue Date
- 9월-2013
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Pyridine-based leuco-TAM molecules; Stereoselective formation; Three-bladed propeller conformation; Y-shaped conformation; Monoclinic crystal; Orthorhombic crystal
- Citation
- SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, v.113, pp.261 - 267
- Indexed
- SCIE
SCOPUS
- Journal Title
- SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
- Volume
- 113
- Start Page
- 261
- End Page
- 267
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/102404
- DOI
- 10.1016/j.saa.2013.04.079
- ISSN
- 1386-1425
- Abstract
- The solid-state structures and unequivocal stereochemistries of isomeric pyridine-based leuco-triarylmethane (LTAM) dyes 2,2'-(2-(pyridin-4 or 3-yl)propane-1,3-diylidene)bis(5-chloro-1,3,3-trimethylindoline) derivatives were established by X-ray crystallography. Surprisingly, the EE isomer was formed for the 4-pyridinyl compound, whereas the 3-pyridinyl compound formed ZE isomers. In addition, the latter have a so-called three-bladed propeller conformation, whereas the former possess a Y-shaped conformation. These pyridine-based LTAM compounds stack to form a dimer, adopting either an orthorhombic, with Pcmn space group, or monoclinic crystal system with P2(1)/n space group in the crystal unit cell. (C) 2013 Elsevier B.V. All rights reserved.
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