نتایج جستجو برای: keywords transition metal complexes

تعداد نتایج: 2459016  

2015
A. K. Chandrakar G. P. Dewangan Neeraj Chandraker R. S. Thakur

The heterogenization of homogeneous catalysts can be achieved by immobilization, grafting, anchoring or encapsulating them in an inert solid like organic polymer or inorganic support. Transition metal complexes having good catalytic properties are immobilized through encapsulation in the super cages of zeolites is called zeolite encapsulated metal complexes (ZEMC) or ship-in-the-bottle complexe...

2014
T. Rajendran Senthil Murugan G. Balakrishnan M. Ganesan

Six transition metal-salen complexes (metal = Fe, Mn and Cr) 1-6 have been synthesized and characterized using different spectroscopic and electrochemical techniques. The binding studies of natural antioxidant, curcumin with the complexes (1-6) have been carried out by electronic absorption spectroscopic technique. The substantial shift in the absorption maximum of complexes (1-6) when they bin...

Journal: :Chemical reviews 2000
T Kondo T A Mitsudo Ta

In organic synthetic reactions, the scope and application of organosulfur chemistry have increased tremendously since sulfur-containing groups serve an important auxiliary function in synthetic sequences.1 Illustrative examples are the reversal of polarity (Umpolung), the enhancement of the acidity of C-H bonds, and the transfer of chirality from sulfur to carbon.2 On the other hand, transition...

2014
Yogesh S. Patel

Novel oligomer metal complexes (2a-f) of the ligand 2,5-bis((4-bromophenyl)carbamoyl) terephthalic acid (1) were prepared using transition metal salts and characterized by various spectroscopic techniques. The geometry of oligomer metal complexes was carried out by electronic spectral analysis and magnetic measurement studies. Polymeric properties have also been carried out. Ligand was synthesi...

Journal: :Inorganic chemistry 2006
John E Ellis

A brief history of substances containing s,p- and d-block metals in negative oxidation states is described. A classification of these species and discussions of formal oxidation state assignments for low-valent transition metals in complexes are included, along with comments on the innocent and noninnocent character of ligands in metalates. Syntheses of highly reduced carbonyl complexes formall...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2004
Yu Bai Fengrui Song Maolian Chen Junpeng Xing Zhiqiang Liu Shuying Liu

According to the strong application background of bioflavonoid and metal-flavonoid complexes, novel electrospray ionization tandem mass spectrometry (ESI-MSn) was applied to investigate the structure and fragmentation mechanism of transition metal-rutin complexes. In the full-scan mass spectra, different stoichiometric ratios of rutin-metal complexes were found. In the reaction between rutin an...

Journal: :Dalton transactions 2013
Marcel Brill Erik Kühnel Corina Scriban Frank Rominger Peter Hofmann

Bulky and electron-rich N-phosphinomethyl-substituted N-heterocyclic carbene transition metal complexes have been prepared in a short and efficient protocol. The modular synthesis allows one to convert borane-protected phosphino-functionalized imidazolium salts into their corresponding metal chelate complexes in a one-pot procedure.

Journal: :Chemical & pharmaceutical bulletin 2000
A A el-Asmy M E Khalifa T H Rakha M M Hassanian A M Abdallah

Complexes of several transition metal ions with alpha-oximinoacetoacetyl pyridine-4-phenylthiosemicarbazone (H3OAPT) have been prepared. Attempts were made to elucidate their geometries by elemental analysis, molar conductance, magnetic measurements and by some spectroscopic (IR, ESR and electronic) techniques. All the investigated metal ions form mononuclear complexes except for CuII, which fo...

Journal: :Chemical communications 2013
Sara Bianco Caterina Musetti A Paul Krapcho Manlio Palumbo Claudia Sissi

Transition metal complexes allow fine tuning of DNA binding affinity and selectivity. Here we report on the nucleic acid recognition properties of a phenanthroline-based ligand coordinated to Ni(2+) or Cu(2+). The resulting complexes clearly bind to telomeric G-quadruplexes at different sites according to the nature of the bound metal ion.

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