Synthesis and Crystal Structures of Tetraethyl Ammonium Inclusion Complex with Urea, Fumarate and Water Molecules as Anionic Host Lattice Building

Abstract

Abstract: A new inclusion complex, (C₂H₅)₄N⁺[C₄H₂O₄^2-] _1/2·CO(NH₂) ₂·H₂O, has been prepared and characterized by X-ray crystallography. Crystal data: space group C₂/c(No.15), a=1.790 9(5) nm, b=1.443 1(4) nm, c=1.444 3(3) nm, β=126.76(2)°, V=2.990 5(13) nm³, Z=4, F(000)= 1 168, μ=0.09 mm^-1, R₁=0.064 7 for 2 088 observed Mo Kα data (|F|²≥2.0σ|F|²). In the crystal structure of the title compound, two urea molecules are linked by a pair of N-H...O hydrogen bonds in the usual shoulder-to-shoulder manner to generate a dimer. These hydrogen-bonded urea dimers are alternately linked by additional pairs of N-H...O hydrogen bonds to form an approximately planar ribbon oriented parallel to the c axis. Bridged alternately by donor O(W)-H...O hydrogen bonds from the water molecules, the fumarate anions form a zigzag wide ribbon running parallel to the c axis. The parallel, alternate arrangement of these two kinds of complementary ribbons facilitates cross-linkage by N-H...O hydrogen bonds to form a puckered anionic layer normal to b axis. The title complex features a sandwich-like structure in which the tetraethylammonium cations occupy the space between urea-fumarate-water layers.

Key words: Urea, Fumarate, Tetraalhyl ammonium cation, Inclusion compound, Crystal structure

CLC Number:

O641

TrendMD:

ZHANG Jin-Nan, YE Ling, ZHENG Xiao-Yan, LI Qi . Synthesis and Crystal Structures of Tetraethyl Ammonium Inclusion Complex with Urea, Fumarate and Water Molecules as Anionic Host Lattice Building[J]. Chem. J. Chinese Universities, 2002, 23(12): 2296.

References

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