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Sheik A. Samath Kadarkaraithangam Jeyasubramanian Subramanian Thambidurai Sickandar Kamardeen Sutharavalli K. Ramalingam 《Transition Metal Chemistry》1994,19(2):157-159
Summary Several bis/tris-salicylaldehyde, salicylaldimine and salicyalethylenediimine chelates of cobalt(III), chromium(III), cobalt(II), nickel(II)
and copper(II) readily react with various brominating agents and undergo α-bromo/cyano/succinimido substitution, with or without
accompanying bromine substitution of the aryl ring. The selectivity of these reactions on the metal-coordinated salicylaldehyde
derivatives allows the preparation in 50–80% yield of hitherto unreported specific α-bromo products. The substituted organic
compounds could be isolated by demetallation of the chelate products. 相似文献
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Samath S. Abdul Raman Mani Raman Natarajan Jeyasubramanian Kadarkarai Thangam Ramalingam Suthamalli K. 《Transition Metal Chemistry》1992,17(1):13-15
Transition Metal Chemistry - The synthesis and structural characterization of new metal(II) chelates (M = CoII, NiII, CuII and ZnII) of neutral conjugated bidentate β-diketone ligands, having... 相似文献
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Summary Halogenation of LnIII, CeIV and ZrOII -diketone/-ketoester derivatives and their mixed ligand complexes of the types Ln(AA)2(Sal) and Ln(AA)(Sal)2 by NCS, NBS and PyHBr3 yield different isomeric products depending on the nature of the solvent medium, the reagent and the reaction time. The halogenation, if carried out in glacial acetic acid, irrespective of the reagent, yields the stable S-hall, product wherein the three chelate rings remain imperturbed in respect of metal coordination. When the reaction is carried out in 5% v/v DMF-CHCl3 employingN-halosuccinimide and maintaining correct reaction times, it is possible to isolate individually three other isomeric products. The isomers prepared are Ln(OO)3, Ln(OO)2(OX), Ln(OO)(OX)2 and Ln(OX)3 where (OO) represents diketone oxygen linkage and (OX) represents diketone oxygen and substituted halogen linkage to the central metal ion. The four linkage isomers have been identified by a comparison of the number of observed3H n.m.r. or13C n.m.r. signals with those expected for a given isomer on the basis of symmetry considerations in the tris-chelated octahedral structures. 相似文献
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Kadarkaraithangam Jeyasubramanian S. Abdul Samath Subramanian Thambidurai Ramachandran Murugesan Suthamalli K. Ramalingam 《Transition Metal Chemistry》1995,20(1):76-80
Summary A 14-membered macrocyclic Schiff base derived from 3-salicylideneacetylacetone ando-phenylenediamine acts as a tetradentate and strongly conjugated ligand to form a cationic solid complex with CuCl2. U.v.-vis. and e.s.r. spectral data reveal a strong ligand to metal -interaction in the square planar complex. C.v. data reveal that the title ligand is able to stabilize the copper(III) oxidation state more effectively than comparable saturated or partially unsaturated macrocyclic ligands and confers a weaker tendency for reduction of copper(II) to copper(I) and copper(0). While the inclusion of a PPh3 ligand suppresses the Cu0 CuI CuII oxidation, imidazole and pyridine strongly enhance the CuII CuIII oxidation of the complex. 相似文献
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