Abstract
Silver(I) halides react with bidentate phosphorus ylides of the type
Ph2P(CH2)(n)PPh2=(H)C(O)C6H4R (n = 1,2) (R = 4-Cl (Y-1, Y-5), 4-Br (Y-2,
Y-6), 4-NO2 (Y-3, Y-7), 4-OMe (Y-4, Y-8)) in CH3CN as a solvent in
equimolar ratios to give complexes of the formulae
(Ph2P(CH2)(n)PPh2C(H)C(O)C6H4R)AgX(2) (X = Cl (1, 4, 7, 10, 13, 16,
19, 22), Br (2, 5, 8, 11, 14, 17, 20, 23) and 1(3, 6, 9, 12, 15, 18, 21,
24)). X-ray analysis demonstrate a binuclear chloro-bridged structure
(Y-Ag(mu-Cl)(2)Ag-Y) in which the ligand coordinates to the silver
center through the P atom in complexes 1 and 10. However, both the
theoretical and experimental data indicate that the ylidic carbon also
has a weak interaction with the Ag ion. Characterization of the obtained
compounds was performed by elemental analysis, IR, H-1, P-31 and C-13
NMR spectroscopy. In addition, the DMSO dissolved ligands and their
complexes were screened in vitro for their antibacterial activity
against 6 Gram positive and negative bacteria. All the synthesized
compounds exhibited significant activity, especially against Gram
negative bacteria. (C) 2014 Elsevier Ltd. All rights reserved.
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