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Synthesis and crystal structures of two metal urea nitrates

Kift, Rebecca L.; Prior, Timothy J.


Rebecca L. Kift


Cu(urea)(2)(H2O)(3)(NO3)center dot(urea)(NO3) (1) and Zn(urea)(4)(H2O)(2)center dot 2(NO3) (2) have been obtained from the corresponding metal nitrates and urea in warm aqueous solvent. These are unusual examples of complexes of transition metals coordinated only by urea and water. 1 crystallizes in the monoclinic space group P2(1)/m with unit cell parameters a = 9.489(3), b = 13.059(3), c = 7.103(2) angstrom and beta = 100.28(3)degrees. The copper ion occupies a 2e position on a mirror plane and displays four short Cu-O bonds (2 x Cu-OH2 and 2 x Cu-O=C(NH2)(2)) and two much longer contacts (Cu-OH2 and Cu-ONO2) consistent with a Jahn-Teller distortion. Between the cations are located unbound urea and nitrate. 2 crystallizes in the monoclinic space group P2(1)/n with a = 6.4239(11), b = 17.690(4), c = 7.5877(13) angstrom and beta = 91.138(14)degrees. The zinc ion resides on the 2a position, an inversion centre, and displays pseudo-octahedral coordination geometry. It is coordinated by four equatorial urea and two axial water molecules. The four molecules of urea are nearly planar and form N-H center dot center dot center dot O intramolecular hydrogen bonds. Unbound charge-balancing nitrate is also present. In each compound there is extensive intermolecular hydrogen bonding between the water, urea, and nitrate present. Pyrolysis of the compounds under 10% hydrogen in nitrogen at 300 degrees C was found to yield metallic copper in the case of 1 and zinc oxide for 2.

Journal Article Type Article
Publication Date Aug 1, 2009
Print ISSN 1074-1542
Electronic ISSN 1572-8854
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 39
Issue 8
Pages 558-563
APA6 Citation Kift, R. L., & Prior, T. J. (2009). Synthesis and crystal structures of two metal urea nitrates. Journal of chemical crystallography, 39(8), 558-563.
Keywords Spectroscopy; Structural Biology; Condensed Matter Physics