with dioximes bearing cyclic linkers, such as cyclohexyl or aryl groups, resulted in insoluble polymeric compounds. The treatment of various bis(salicylaldiminates) with titanium and zirconium alkoxides resulted in compounds with the same composition [TiL(OR)2}2], in which, however, two monomeric Ti(OR)2 units are bridged by the ligands L. The two structural possibilities can be distinguished by low‐energy
用 1,5-戊二肟或 2,5-己二肟处理钛醇盐导致形成复合物 [Ti L (OR) 2 } 2 ],其中二肟配体 ( L ) 桥接二聚体 Ti 2 (μ 2 -或) 2 个单位。通过单晶结构分析、ESI质谱以及一维和二维溶液核磁共振光谱确定了配合物的结构。相比之下,用带有环状连接基团(例如环己基或芳基)的二肟处理钛醇盐会产生不溶性聚合物。用钛和锆的醇盐处理各种双(水杨醛酸二甲酯)产生具有相同组成的化合物 [TiL (OR) 2 } 2 ],然而,其中两个单体Ti(OR) 2单元由配体L桥接。由于它们不同的碎裂模式,这两种结构可能性可以通过低能量碰撞诱导解离来区分。
Salicylaldimine-based receptor as a material for iron(III) selective optical sensing
作者:Natalia Łukasik、Ewa Wagner-Wysiecka
DOI:10.1016/j.jphotochem.2017.06.011
日期:2017.9
α,α-Bis(salicylimino)-m-xylene (L) was prepared using both conventional and microwave-assisted procedure. The compound exhibits ability to colorimetric recognition of iron(III) ions in aqueous environment, what is manifested by significant color change from yellow to purple. In DMSO: water (9:1 v/v) solvent system, receptor creates with iron(III) cations complexes of 2:1 stoichiometry (L:Fe3+) with
用常规方法和微波辅助方法制备α,α-双(水杨酰亚胺)-间二甲苯(L)。该化合物在水性环境中具有比色识别铁(III)离子的能力,这表现为从黄色到紫色的明显颜色变化。在DMSO:水(9:1 v / v)溶剂系统中,受体与铁(III)阳离子形成化学计量比为2:1(L:Fe 3+)的络合物,稳定常数(log K)为7.54±0.21。将配体掺入聚合物基质(三乙酸纤维素)中可以在100%的pH值为2.9的水溶液中检测铁(III),检测限为2.73×10 -6M 。
Synthesis, crystal structure, and catalytic studies on dinuclear copper(II) mesocates
copper(II) acetate in 2:2 equivalent of L:M ratio, resulted in a series of binuclear [Cu2(m-xysal)2] neutral complexes 1–5. The crystal structures determined for the complexes 1 and 2 indicate a dinuclear association. The CH⋯π interaction observed between the metal-chelate ring and the hydrogens associated with m-xylene spacer moiety being first in this series of complexes, is demonstrated to stabilize the
摘要亚胺基双齿双配体H2-m-xysal(L1H2); H 2-间-xysal-Cl,(L 2 H 2);H 2-间乙醛-Br,(L 3 H 2);H 2-间-xysal-OCH 3(L 4 H 2);合成并表征了H 2 -m-xysal-(t-Bu)2,(L 5 H 2)。这些取代的1,3-双(羟基苄基)-二氨基二甲苯二阴离子配体在以2:2当量的L:M比例用乙酸铜(II)处理后,生成了一系列双核[Cu2(m-xysal)2]中性络合物1–5。为配合物1和2确定的晶体结构表明为双核缔合。在金属螯合物环和与间二甲苯间隔基相关的氢之间的CH⋯π相互作用是该系列配合物中的首位,已证明可通过分子内自组装过程稳定螺旋构象。对于室温固态样品获得的配合物2、3和5,在EPR光谱上的共振位置和ΔMs=±1特征的缺失表明,尽管金属中心存在于双核单元中,但它们与彼此之间具有非相互作用的单体型金属-金属缔合。所
Uranyl(VI) binding by bis(2-hydroxyaryl)diimine and bis(2-hydroxyaryl)diamine ligand derivatives. Synthetic, X-ray, DFT and solvent extraction studies
作者:Harold B. Tanh Jeazet、Kerstin Gloe、Thomas Doert、Jens Mizera、Olga N. Kataeva、Satoru Tsushima、Gert Bernhard、Jan J. Weigand、Leonard F. Lindoy、Karsten Gloe
DOI:10.1016/j.poly.2015.01.005
日期:2016.1
[UO2(H2L1)(NO3)2] in a simulated methanol environment is in accord with this complex maintaining its solid state conformation in solution. Solvent extraction experiments (water/chloroform) employing H2L1–H2L7 in the organic phase and uranyl(VI) nitrate in the aqueous phase showed that both amine derivatives, H2L8 and H2L9, yielded enhanced extraction of UO 2 2 + over the corresponding imine derivatives, H2L1
Flexible cofacial binuclear metal complexes derived from α,α-bis(salicylimino)-m-xylene
作者:Andrew W. Maverick、Ravi K. Laxman、Mark A. Hawkins、Daniel P. Martone、Frank R. Fronczek
DOI:10.1039/b412666a
日期:——
The tetradentate Schiff-base ligand SIXH2
(α,α-bis(salicylimino)-m-xylene), prepared from salicylaldehyde and m-xylylenediamine, forms cofacial binuclear complexes with Pd and Cu. Of the two isomers possible (trans-syn and trans-anti) for M2(SIX)2, these complexes crystallize exclusively as the trans-anti isomer. In ansolvous Pd2(SIX)2, the metal-containing planes are approximately parallel, with Pdâ¯Pd 4.416(1)
à . Pd2(SIX)2 also forms a crystalline solvate, in which the molecules adopt a more open conformation with longer metalâmetal distances (5.109(1) and 5.112(1)
à ). The Mâ¯M distance is significantly longer in Cu2(SIX)2
(6.653(1)
à ), because of conformational changes in the m-xylylene moieties and substantial tetrahedral distortion about Cu.