Spectroscopic Studies and Crystal Structure of 4-(2-Hydroxy-3-Methoxybenzylideneamino)-N-(5-Methylisoxazol-3-yl) Benzenesulfonamide
作者:Mustafa Yıldız、Hüseyin Ünver、Diğdem Erdener、Nazan Ocak İskeleli
DOI:10.1007/s10870-010-9723-9
日期:2010.8
Schiff base 4-[(2-hydroxy-3-methoxybenzylideneamino)-N-(5-methylisoxazol-3-yl)benzene-sulfonamide has been synthesized from the reaction of 4-amino-N-(5-methylisoxazol-3-yl)benzenesulfonamide(sulfamethoxazole) with 2-hydroxy-3-methoxybenzaldehyde. It has been characterized by elemental analysis, MS, IR, 1H NMR, 13C NMR, HETCOR and UV–Visible techniques. The structure of it also has been examined crystallographically. For the compound exist as dominant form of enol-imines in both the solid state and the solutions. It crystallizes in the monoclinic space group P21/c with a = 8.2694(7), b = 8.3453(5), c = 26.260(2) Å, β = 97.142(7) °, V = 1798.1(2) Å3, D x = 1.431 g cm−3, R 1 = 0.0529 and wR 2 = 0.1370 [I > 2σ(I)], respectively. The tautomerism in the Schiff base ligands plays an important role for distinguishing their photochromic and thermochromic characteristics. Both phenomena is associated with a proton transfer (enol-imine, O–H···N, keto-amine, O···H–N).
希夫碱 4-[(2-羟基-3-甲氧基苯亚氨基)-N-(5-甲基异恶唑-3-基)苯磺酰胺是由 4-氨基-N-(5-甲基异恶唑-3-基)苯磺酰胺(磺胺甲噁唑)与 2-羟基-3-甲氧基苯甲醛反应合成的。已通过元素分析、质谱、红外光谱、1H NMR、13C NMR、HETCOR 和紫外-可见光技术对其进行了表征。此外,还对其结构进行了晶体学研究。该化合物在固态和溶液中都以烯醇-亚胺的主要形式存在。它在单斜空间群 P21/c 中结晶,a = 8.2694(7), b = 8.3453(5), c = 26.260(2) Å, β = 97.142(7) °, V = 1798.1(2) Å3, D x = 1.431 g cm-3, R 1 = 0.0529 和 wR 2 = 0.1370 [I > 2σ(I)]。希夫碱配体中的同分异构现象对于区分它们的光致变色和热致变色特性起着重要作用。这两种现象都与质子转移有关(烯醇-亚胺,O-H--N;酮胺,O-H-N)。