Azoalkane-DDQ Arrays in the Solid State. New Donor-Acceptor Interactions for Crystal Engineering
作者:
M.L. Greer,
SilasC. Blackstock,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 313,
issue 1
页码: 55-64
ISSN:1058-725X
年代: 1998
DOI:10.1080/10587259808044259
出版商: Taylor & Francis Group
关键词: crystal engineering;donor-acceptor complexes;azoalkanes;DDQ
数据来源: Taylor
摘要:
A new set of donor-acceptor (DA) complexes between azoalkanes and 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) is reported. Bis(cis-azoalkane)s are found to bind DDQ in solution, with complex formation constants in CH2Cl2that range from 22–76 M−1. Bis(azo)/DDQ crystalline solids are isolable and their crystal structures have been determined. Short intermolecular contacts in the crystals between the azo nitrogens and quinone ring carbons of 2.9–3.1 Å denote D-A “bonds” whose geometry is consistent with azo HOMO (n°)/DDQ LUMO (π*) overlap. The DA “bonding” promotes one-dimensional supramolecular ordering in the cocrystal which is organized as parallel (-DD-A-)nstrands. Thus, the azo/DDQ DA “bond” serves as a new crystal engineering synthon for preparing one-dimensional, two-component solids.
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