Hydrogen-bonded urea-anion host lattices .4. Comparative study of inclusion compounds of urea with tetraethylammonium and tetraethylphosphonium chlorides
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AbstractNew inclusion complexes (C2H5)(4)E+Cl-. 2(NH2)(2)CO (1, E = N; 2, E = P) have been prepared and characterized by X-ray crystallography. Crystal data, MoK alpha radiation: 1, space group P2(1)/c, Z = 4, a = 10.492(6), b = 14.954(8), c = 10.335(6) Angstrom, beta = 91.02(5)degrees, R-F = 0.050 for 1527 observed data; 2, space group Pmn2(1), Z = 2, a = 7.446(1), b = 9.200(2), c = 12.753(3) , R-F = 0.079 for 519 observed data. In compound I the tetraethylammonium ions are sandwiched between puckered layers, which are constructed from the linkage of chloride ions and wide urea ribbons each composed of a broadside arrangement of centrosymmetric hydrogen-bonded urea dimers. in the crystal structure of 2, hydrogen-bonded urea ribbons running parallel to [100] are connected by chloride ions to generate a sawtooth wave layer, and stacked columns of tetraethylphosphonium cations are sandwiched between adjacent layers.
All Author(s) ListLi Q, Mak TCW
Journal nameJournal of Inclusion Phenomena and Macrocyclic Chemistry
Volume Number28
Issue Number2
Pages151 - 161
LanguagesEnglish-United Kingdom
Keywordshydrogen bonding; inclusion compound; tetraethylammonium; tetraethylphosphonium; urea
Web of Science Subject CategoriesChemistry; Chemistry, Multidisciplinary; Crystallography

Last updated on 2021-22-09 at 02:07