Interaction between salicylic acid and indomethacin in binding to human serum albumin.
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The title complex, [Ag4(C7H5O3)2(C8H6N2)4(C7H6O3)4], lies about an inversion centre and has a unique tetranuclear structure consisting of four Ag(I) atoms bridged by four N atoms from two 1,8-naphthyridine (napy) ligands to form an N:N'-bridge and four O atoms from two salicylate (SA) ligands to form an O:O'-bridge. The Ag atoms have distorted octahedral coordination geometry. The centrosymmetric Ag4 ring has Ag-Ag separations of 2.772 (2) and 3.127 (2) A, and Ag-Ag-Ag angles of 107.70 (4) and 72.30 (4) degrees . All SA hydroxy groups take part in intramolecular O-H...O hydrogen bonding. In the crystal packing, the napy rings are oriented parallel and overlap one another. These pi-pi interactions, together with weak intermolecular C-H...O contacts, stabilize the crystal structure.