Crystal Structure of a Linear Ag(I) Complex with Niflumic Acid and Its Fluorescent Property

1 INTRODUCTION Niflumic acid (2-[3-(trifluoromethyl) phenyl] amino nicotinic acid, HNifa) is an organic fluoro compound used in the preparation of ‘Donalgin’ as the active substance. In medicine, HNifa has been widely used as a non-steroidal anti-inflammatory analgetic drug[1]. The extensive application of this preparation in medical practice has attracted much interest in other various biological fields such as the determination in serum, urine[2～4], and coordination behaviors with …

Crystal Structure of a Linear Ag(I) Complex with Niflumic Acid and Its Fluorescent Property

A novel Ag(I) complex AgH(Nifa)2 1 (C26H17AgF6N4O4, Mr = 671.31) was synthe- sized through hydrothermal reaction of Ag2SO4 and Niflumic acid (HNifa), and characterized by single-crystal X-ray determination, IR and fluorescent spectra. Crystal data for 1: monoclinic, space group C2/c, with a = 9.5446(16), b = 12.3203(16), c = 21.056 (3) ', β = 98.075(2)o, V = 2451.5(6) '3, T = 293(2) K, Z = 4, Dc = 1.819 g/cm3, F(000) = 1336, μ = 0.912 mm-1, S = 1.001, ('ρ)min = –0.849, the final R = 0.0391 and wR = 0.1286. The local geometry around the central metal Ag(I) ion is linear. Two carboxylic acids of neighboring ligands sharing one hydrogen atom by two hydro- gen bonds result in the formation of an infinite hydrogen-bonded chain. Solid-state fluorescence of 1 at room temperature shows that the maximal emission peak occurs in 439 nm.