Half‐sandwich Ru (II) complexes containing (N, O) Schiff base ligands: Catalysts for base‐free transfer hydrogenation of ketones
作者:C.E. Satheesh、Pushpanathan N. Sathish Kumar、P. Raghavendra Kumara、Ramasamy Karvembu、Amar Hosamani、M. Nethaji
DOI:10.1002/aoc.5111
日期:2019.10
Two new half‐sandwich Ru (II)(p‐cymene) complexes (1 and 2) containing dopamine‐based (N, O) Schiff base ligands (L1H and L2H) were synthesized and characterized by FT‐IR, UV–Visible and 1H & 13C NMR spectral techniques, and elemental analyses. The spectroscopic and analytical data revealed monobasic bidentate coordination of the ligands with Ru ion. The molecular structures of L1H, L2H and 2 were
Synthesis and choleretic activity of 2-benzyltetrahydroisoquinoline derivatives
作者:A. N. Nabiev、V. I. Vinogradova
DOI:10.1007/bf02464307
日期:1997.9
Some of the N-benzyltetrahydroisoquinoline derivatives synthesized in our previous works [ 1, 2] exhibit a pronounced choleretic activity. However, we failed to find any data on the effect of these compounds on the process of bile secretion and the antitoxic function of liver in the available literature. In this connection it was of interest to continue our investigations on the synthesis of N-ben
Synthesis, structural characterization, antimicrobial and DNA binding studies of homoleptic zinc and copper complexes of NO Schiff bases derived from homoveratrylamine
Abstract Four new homoleptic zinc (1 and 2) and copper (3 and 4) complexes of two Schiff base ligands (L1H and L2H) derived from 2-(3,4-dimethoxyphenyl)ethan-1-amine (5), a dimethyl derivative of dopamine were synthesized. All four complexes were well characterized by elemental analysis, FT-IR and UV–Vis., spectroscopy. Further, the zinccomplexes (1 and 2) were characterized by 1H and 13C1H} NMR
Synthesis, characterisation and antimicrobial activity of new palladium and nickel complexes containing Schiff bases
作者:C.E. Satheesh、P. Raghavendra Kumar、P. Sharma、K. Lingaraju、B.S. Palakshamurthy、H. Raja Naika
DOI:10.1016/j.ica.2015.11.017
日期:2016.3
New Schiff base ligands were synthesized by condensation of 2-(3,4-dimethoxyphenyl)ethanamine with 2-hydroxy benzaldehyde ((LH)-H-1) and 2'-hydroxy acetophenone ((LH)-H-2) respectively. Reaction of (LH)-H-1 or (LH)-H-2 with Na2PdCl4 or NiCl2 center dot 6H(2)O in 2:1 ratio obtained four new coordination complexes [M(L1-2)(2)] (where M = Pd(II); 1 and 2 and M = Ni(II); 3 and 4). Both the ligands and four complexes were characterised by elemental analysis, FT-IR and UV-Vis, spectroscopy. (LH)-H-1, (LH)-H-2, 1 and 2 were also characterised by H-1 and C-13H-1} NMR spectroscopy. The molecular structures of 1 and 3 were determined by single crystal X-ray diffraction. The spectroscopic and crystal structure data showed that the ligands coordinated to M (II) ion in a bidentate monoanionic (O , N) fashion. The Pd-O and Pd-N bond lengths in 1 are 1.984(11) and 2.020(12) angstrom in 3 the Ni-O and Ni-N bond lengths are 1.8222(13) and 1.9262(15) angstrom respectively. The C=N bond length in 3 found 1.290(2) angstrom which was shorter than 1.310(19) angstrom in 1. The bond angles provided square planar geometry around Pd(II) and Ni(II) in both 1 and 3. There exists C-H center dot center dot center dot O type (2.50-2.52 angstrom) intermolecular hydrogen bonding in both 1 and 3 resulting in supramolecular structures. The antimicrobial activity of new Schiff base ligands and their Pd(II) and Ni(II) complexes against pathogenic microbial strains by agar well diffusion method was conducted. All the ligands and complexes showed significant antibacterial and antifungal activities. The bacterial and fungi growth inhibition activity of ligands has been increased on complexation as well as among complexes palladium complexes were found better antibacterial and antifungal agents than the nickel complexes of corresponding ligands. Ligand (LH)-H-1 and the complex 2 showed highest antibacterial activity against Pseudomonas desmolyticum and highest antifungal activity against Candida albicans. (C) 2015 Elsevier B.V. All rights reserved.