Synthesis of Novel Crowned Salicylaldimine Schiff Bases
作者:Shengying Qin、Wei Zeng、Zhihua Mao、Jianzhang Li
DOI:10.1055/s-2004-822330
日期:——
Salicylaldimine Schiff bases containing oxa-crown ether (HL ¹ , HL ² , HL ³ , HL 4 and H 2 L 5 ) were synthesized via condensation of (15-crown-5) salicylaldehyde with amino-compound and characterized by 1H NMR, IR, MS spectroscopy and elemental analysis. The crystal structures of HL ² were determined from X-ray diffraction data.
Studies on the photochemical behavior of N-salicylidenaniline in chloroform
作者:Liyan Zhao、Wujiong Xia、Baoquan Gou、Yu Lu、Chao Yang、Dazhi Li
DOI:10.1016/j.saa.2012.04.016
日期:2012.9
An N-salicylidenaniline (SA), compound 1 with 15-crown-5 moiety, was synthesized. The time-dependent NMR was used to track its photochromic process. The experimental results showed that ultraviolet irradiation would lead compound 1 to decompose into the corresponding salicylaldehyde and amine in chloroform solution, instead of experiencing a photochromic process. By the same method, the reported photochromic
Three coumarin reagents carrying crown-ether moieties as catalytic sites for the fluorescence derivatization of carboxylic acids were designed and synthesized. The catalytic abilities of these reagents were evaluated based on the stability constants (Ks) for complexation with metal acetates in methanol. The derivatization reactions of carboxylic acids with these reagents proceeded self-catalytically without crown-ether catalysts, and gave the corresponding coumarin esters in good yields. It was found that their reactivities significantly depended upon the metal-binding ability of the reagent molecules from kinetic treatments of the reactions. The derivatized products showed remarkably high fluorescence quantum yields of above 0.8 in methanol. These results suggested that the functionalization of reagents was a quite useful approach for the development of new-type analytical reagents.
Synthesis and complexation properties of 3-Aroylcoumarin crown ethers. A new class of photoactive macrocycles.
作者:Maria Teresa Alonso、Ernesto Brunet、Concepción Hernandez、Juan Carlos Rodriguez-Ubis
DOI:10.1016/s0040-4039(00)60154-5
日期:1993.11
Synthesis of fluoroionophores consisting of 3-benzoylcoumarins fused with crownethers in two different modes are described. The resulting macrocycles bore emission properties strongly dependent on metal ions and coumarin substitution and may be therefore used as cation dependent fluorescence signaling systems or triplet sensitizers for lanthanide luminescence.
Synthesis, complex formation, spectral and crystallographic investigations of new crown ethers containing recognition site for sodium. Part V
作者:Z Hayvalı、M Hayvalı、Z Kılıç、T Hökelek
DOI:10.1016/s0022-2860(01)00603-2
日期:2001.10
Abstract The monotopic crownether ligands (5 and 6) and their sodium perchloratecomplexes (5a and 6a) have been synthesized. The crystalstructure of (5) has been determined, which contains 1 mol of water molecule. Compound (5) crystallizes in the monoclinic space group C 2/ c with a =39.324(8), b =8.011(1), c =16.877(4) A, β =107.61(2)°, V =5067.5(2) A 3 , Z =8 and D calc =1.289 g m −3 . The relative
摘要 合成了单位冠醚配体(5 和 6)及其高氯酸钠配合物(5a 和 6a)。已确定(5)的晶体结构,其中含有1 mol水分子。化合物(5)在单斜空间群C 2/ c 中结晶,a =39.324(8), b =8.011(1), c =16.877(4) A, β =107.61(2)°, V =5067.5(2) ) A 3 ,Z =8 且D calc =1.289 gm -3 。相对大环内孔尺寸估计为供体原子与其质心平均距离的两倍约为 1.68 A。关于 CN 亚胺键的非那宗和苯并冠醚前体处于反 ( E ) 构型。CN 亚胺键长和 CN-C 键角分别为 1.270(3) A 和 120.4(2)°。化合物(6) 和(6a) 为苯酚-亚胺形式,由 1 H-NMR 和紫外-可见数据支持。