Author:
Smith Graham,Coyne Michael G.,White Jonathan M.
Abstract
Molecular adducts of 1,1-diethylurea with the nitro-substituted aromatic
carboxylic acids 2-nitrobenzoic acid,
[(C7H5NO4)(C5H12N2O)]
(1), 3-nitrobenzoic acid,
[(C7H5NO4)(C5H12N2O)]
(2), 4-nitrobenzoic acid,
[(C7H5NO4)2(C5H12N2O)]
(3), 3,5-dinitrobenzoic acid,
[(C7H4N2O6)(C5H12N2O)]
(4), 5-nitrosalicylic acid,
[(C7H5NO5)(C5H12N2O)]
(5) and 3,5-dinitrosalicylic acid,
[(C7H4N2O7)(C5H12N2O)]
(6), have been prepared and characterized by using infrared spectroscopy, and,
in the case of four of these [(1), (4), (5) and (6)], by
single-crystal X-ray diffraction methods. In all examples, primary cyclic
hydrogen-bonding interactions are found between the amide group of the
substituted urea and the carboxylic acid group of the acid, while further
peripheral associations result predominantly in simple chain polymeric
structures, and in one case [adduct (1)], a cyclic tetramer. The
crystal structure of the parent 1,1-diethylurea has also been determined,
revealing a cyclic hydrogen-bonded tetramer which forms into a chain polymer
by weak hydrogen-bonding associations.
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20 articles.
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