Synthesis of Mononuclear Metal Complexes with Some Tetradentate Schiff Base Ligands

Thakkar, N. V.; Patil, Raju M.

doi:10.1080/00945710009351826

Cited by 18 publications

(3 citation statements)

References 16 publications

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“…Thakkar and Patil have previously synthesized Cu(II), Ni(II) and Co(II) complexes of ligands related to H 2 L 3 . 12 Fujita has investigated the use of similar tetradentate ligands containing salicylaldimine units bridged through C n chains (n = 2-6) 13 in Group 4 polymerization systems, but the issue of catalyst deactivation was not addressed.…”

Section: Resultsmentioning

confidence: 99%

Group 4 catalysts for ethene polymerization containing tetradentate salicylaldiminato ligands

et al. 2006

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The structural properties of three new classes of titanium and zirconium complex bearing tetradentate salicylaldiminato proligands are elucidated using X-ray diffraction and NMR spectroscopy. On activation with MAO co-catalyst, their behaviour in ethene polymerization depends strongly on the nature of the structure and the substitution pattern. One titanium complex based on a 2-aminobenzylamine (C3-chain) backbone has a trans arrangement of the co-ligand sites and, unsurprisingly, does not polymerize ethene. The 1,8-diaminonaphthalene (C3-chain) backbone gives a rather ring-strained cis complex, but was also unproductive. A range of cis complexes of zirconium with the 2,2'-diaminobibenzyl (C6-chain) backbone give low to moderate productivities of multimodal poly(ethene), while in contrast the structurally analogous titanium compounds provide highly active, single site catalysts. Thermal degradation of these catalysts is slowed significantly by a substitution pattern on the phenolate unit which sterically protects the imine donor unit; a phenomenon which has been previously observed in much lower activity catalysts based on 2,2'-diaminobiphenyl (C4-chain) but which does not improve the stability of the very highly active unbridged systems.

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Section: Resultsmentioning

confidence: 99%

Group 4 catalysts for ethene polymerization containing tetradentate salicylaldiminato ligands

et al. 2006

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“…Compound The phenolic oxygen, on loss of the hydrogen proton, causing υ (C O) 1273 cm −1 shifted to higher wavenumber of 1310 cm −1 [35] in the complex spectrum, which suggests the coordination of Zn(II) through deprotonated enolic oxygen.…”

Section: Table I Characteristic Ir Data For Pmpap-sah and Its Complexmentioning

confidence: 98%

Synthesis and Characterization of Tetra-μ-phenolatotetrazinc(II) Complex with 1-Phenyl-3-Methyl-4-(salicylidene hydrazone)-Phenylethylene-Pyrazolone-5

Zhang

Liu

et al. 2005

Struct Chem

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A new phenoxy-bridged tetranuclear zinc(II) complex with 1-phenyl-3-methyl-4-(salicylidene hydrazone)-phenylethylene-pyrazolone-5 (PMPaP-SAH) has been synthesized and characterized by elemental analysis, IR spectrum, molar conductivity, TG-DTA and single crystal X-ray diffraction. The X-ray diffraction analysis shows that the complex is tetranuclear with a rectangular Zn 4 core and metal ions are held together by four µ-phenoxo bridges that lead to the formation of the tetra-µ-phenolatotetrazinc(II) complex. Each Zn(II) ion in the complex is penta-coordinated with a slightly distorted trigonal bipyramid coordination sphere.

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“…Schiff bases play an important role as central ligands in main group and transition metal coordination chemistry (Bulut et al 2005;Thakkar and Patil 2000;Bermejo et al 1999;Temel, Ç akır, Otludil 2001;Temel, Ç akır, and Ugraş 2001;Temel, Ilhan, and Ş ekerci 2002). Metal complexes of tetradentate Schiff base ligands find applications as models of certain metal enzymes and in catalysis and materials chemistry (Garoufis et al 1998).…”

Section: Introductionmentioning

confidence: 98%

Fluorimetric Analysis of Aluminum in Diluted Hemodialysis Solutions by Using a Novel Schiff Base

2010

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A spectrofluorimetric method has been developed for trace amount of aluminum(III) by using a novel Schiff base, N,N 0 -bis(salicylidene)-1,4-diaminobuthane (BUTAS), and 4-methyl-2-aminophenol (OAP). Since the aluminum complexes are generally fluorescent, aluminum(III) increases the fluorescence intensity of BUTAS-OAP by formation of Al-BUTAS-OAP complex. The fluorescence of the complex is measured at an excitation wavelength of 410 nm with an emission at 526 nm. Aluminum(III) can be detected within a concentration limit of 0.11-1.62 ppb and the lowest detection limit being 0.07 ppb. The proposed method was applied to diluted hemodialysis solution and spectrofluorimetric data was compared with data of standard pharmacopoeia method.

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Synthesis of Mononuclear Metal Complexes with Some Tetradentate Schiff Base Ligands

Cited by 18 publications

References 16 publications

Group 4 catalysts for ethene polymerization containing tetradentate salicylaldiminato ligands

Group 4 catalysts for ethene polymerization containing tetradentate salicylaldiminato ligands

Synthesis and Characterization of Tetra-μ-phenolatotetrazinc(II) Complex with 1-Phenyl-3-Methyl-4-(salicylidene hydrazone)-Phenylethylene-Pyrazolone-5

Fluorimetric Analysis of Aluminum in Diluted Hemodialysis Solutions by Using a Novel Schiff Base

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