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Issue 12, 2008
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Silver(I) complexes of N-4-halophenyl-N′-4-pyridyl ureas. Isostructurality, urea⋯nitrate hydrogen bonding, and Ag⋯halogen interaction

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Abstract

Silver–pyridyl complexes of N-4-X-phenyl-N′-4-pyridyl urea (X = Cl, Br, I, F, H; L1–L5) are crystalline solids of the formula [Ag(L)2](S)(NO3) (S = MeCN) for chloro, bromo and iodo ligands (1–3). Solid solution crystals 7–9 of bromo and iodo derivatives were prepared with L2 : L3 : mixed ligands ratio of 46 : 37 : 17, 65 : 19 : 16 and 94 : 0 : 6 (mixed = bromo–Ag–iodo) in the product. The significance of Ag⋯halogen interaction decreases in the expected order I > Br > Cl in isostructural crystal structures. Interestingly, the polar δ+ region of the C–X bond interacts with nitrate O in a near-linear approach and the equatorial δ region approaches Ag+ metal atom at a bent angle, consistent with charge polarization at the heavy halogens. The fluoro and protio ligand silver complexes 4–6 are quite different from structures 1–3. Urea–nitrate N–H⋯O hydrogen bonds have R22(8), R21(6), R43(14) and R44(16) cyclic motifs.

Graphical abstract: Silver(I) complexes of N-4-halophenyl-N′-4-pyridyl ureas. Isostructurality, urea⋯nitrate hydrogen bonding, and Ag⋯halogen interaction

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Publication details

The article was received on 20 Jun 2008, accepted on 22 Sep 2008 and first published on 14 Oct 2008


Article type: Paper
DOI: 10.1039/B810549A
Citation: CrystEngComm, 2008,10, 1891-1898
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    Silver(I) complexes of N-4-halophenyl-N′-4-pyridyl ureas. Isostructurality, urea⋯nitrate hydrogen bonding, and Ag⋯halogen interaction

    S. K. Chandran, R. Thakuria and A. Nangia, CrystEngComm, 2008, 10, 1891
    DOI: 10.1039/B810549A

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