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Akhil R. Chakravarty - One of the best experts on this subject based on the ideXlab platform.
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dna cleavage by new oxovanadium iv complexes of n salicylidene α amino acids and phenanthroline bases in the photodynamic therapy window
Inorganic Chemistry, 2007Co-Authors: Pijus K Sasmal, Ashis K Patra, Munirathinam Nethaji, Akhil R. ChakravartyAbstract:Oxovanadium(IV) complexes [VO(salmet)(B)] (1−3) and [VO(saltrp)(B)] (4−6), where salmet and saltrp are N-salicylidene-l-methionate and N-salicylidene-l-tryptophanate, respectively, and B is a N,N-donor heterocyclic base (viz. 1,10-phenanthroline (phen, 1, 4), dipyrido[3,2-d:2‘,3‘-f]quinoxaline (dpq, 2, 5), and dipyrido[3,2-a:2‘,3‘-c]phenazine (dppz, 3, 6)) are prepared and characterized and their DNA binding and photoinduced DNA cleavage activity studied. Complexes 1, 2, and 4 are structurally characterized by single-crystal X-ray crystallography. The molecular structure shows the presence of a vanadyl group in the VO3N3 coordination geometry. The dianionic α-amino acid Schiff base acts as a tridentate O,N,O-Donor Ligand in a meridional binding mode. The N,N-donor heterocyclic base displays a chelating mode of bonding with a N-donor site trans to the oxo group. The complexes show a d−d band in the range of 680−710 nm in DMF with a shoulder near 840 nm. They exhibit an irreversible oxidative cyclic voltamm...
Pijus K Sasmal - One of the best experts on this subject based on the ideXlab platform.
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dna cleavage by new oxovanadium iv complexes of n salicylidene α amino acids and phenanthroline bases in the photodynamic therapy window
Inorganic Chemistry, 2007Co-Authors: Pijus K Sasmal, Ashis K Patra, Munirathinam Nethaji, Akhil R. ChakravartyAbstract:Oxovanadium(IV) complexes [VO(salmet)(B)] (1−3) and [VO(saltrp)(B)] (4−6), where salmet and saltrp are N-salicylidene-l-methionate and N-salicylidene-l-tryptophanate, respectively, and B is a N,N-donor heterocyclic base (viz. 1,10-phenanthroline (phen, 1, 4), dipyrido[3,2-d:2‘,3‘-f]quinoxaline (dpq, 2, 5), and dipyrido[3,2-a:2‘,3‘-c]phenazine (dppz, 3, 6)) are prepared and characterized and their DNA binding and photoinduced DNA cleavage activity studied. Complexes 1, 2, and 4 are structurally characterized by single-crystal X-ray crystallography. The molecular structure shows the presence of a vanadyl group in the VO3N3 coordination geometry. The dianionic α-amino acid Schiff base acts as a tridentate O,N,O-Donor Ligand in a meridional binding mode. The N,N-donor heterocyclic base displays a chelating mode of bonding with a N-donor site trans to the oxo group. The complexes show a d−d band in the range of 680−710 nm in DMF with a shoulder near 840 nm. They exhibit an irreversible oxidative cyclic voltamm...
Shyamal Kumar Chattopadhyay - One of the best experts on this subject based on the ideXlab platform.
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cu ii complexes of a tridentate n n o donor schiff base of pyridoxal synthesis x ray structures dna binding properties and catecholase activity
New Journal of Chemistry, 2018Co-Authors: Satyajit Mondal, Moumita Chakraborty, Antu Mondal, Bholanath Pakhira, Alexander J Blake, Ekkehard Sinn, Shyamal Kumar ChattopadhyayAbstract:Two new Cu(II) complexes [Cu(L1)(N3)](1) and [Cu(L1)(NCS)]n(2), where HL1 ((E)-4-((2(dimethylamino)ethylimino)methyl)-5-(hydroxymethyl)-2-methylpyridin-3-ol) is a N,N,O-Donor Schiff base Ligand, have been synthesized. These complexes were characterized on the basis of spectroscopic, electrochemical, and other physicochemical properties. X-ray crystal structure determination reveals that in complex 1, Cu(II) is in a square planar geometry with the N,N,O-Donor Ligand and a terminally coordinated azide ion. In complex 2, however, Cu(II) assumes a square pyramidal geometry, and apart from the tridentate Schiff base Ligand there is a thiocyanate ion, which acts in a μ1,3-bridging mode, connecting adjacent Cu(II) atoms in an axial-equatorial fashion forming an one dimensional chain. Cyclic voltammetry shows that complexes undergo Cu(II)/Cu(I) reductions at −0.40 to −0.55V followed by imine reduction at around −0.7V. Cu(I)/Cu(0) reduction is observed at approximately −0.9V. Complex 1 also shows appreciable catalytic activity for the aerial oxidation of 3,5 DTBCH2 to DTBQ (catecholase activity). Both the complexes also show strong binding affinity towards calf-thymus DNA.
Hsinhung Chen - One of the best experts on this subject based on the ideXlab platform.
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1 1 1 tris hydroxymethyl ethane as a new efficient and versatile tripod Ligand for copper catalyzed cross coupling reactions of aryl iodides with amides thiols and phenols
Organic Letters, 2006Co-Authors: Yaojung Chen, Hsinhung ChenAbstract:1,1,1-Tris(hydroxymethyl)ethane was presented as a new, efficient, and versatile tridentate O-Donor Ligand suitable for the copper-catalyzed formation of C−N, C−S, and C−O bonds. This inexpensive and commercially available tripod Ligand has been demonstrated to facilitate the copper-catalyzed cross-coupling reactions of aryl iodides with amides, thiols, and phenols to afford the corresponding desired products in good to excellent yields.
Munirathinam Nethaji - One of the best experts on this subject based on the ideXlab platform.
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dna cleavage by new oxovanadium iv complexes of n salicylidene α amino acids and phenanthroline bases in the photodynamic therapy window
Inorganic Chemistry, 2007Co-Authors: Pijus K Sasmal, Ashis K Patra, Munirathinam Nethaji, Akhil R. ChakravartyAbstract:Oxovanadium(IV) complexes [VO(salmet)(B)] (1−3) and [VO(saltrp)(B)] (4−6), where salmet and saltrp are N-salicylidene-l-methionate and N-salicylidene-l-tryptophanate, respectively, and B is a N,N-donor heterocyclic base (viz. 1,10-phenanthroline (phen, 1, 4), dipyrido[3,2-d:2‘,3‘-f]quinoxaline (dpq, 2, 5), and dipyrido[3,2-a:2‘,3‘-c]phenazine (dppz, 3, 6)) are prepared and characterized and their DNA binding and photoinduced DNA cleavage activity studied. Complexes 1, 2, and 4 are structurally characterized by single-crystal X-ray crystallography. The molecular structure shows the presence of a vanadyl group in the VO3N3 coordination geometry. The dianionic α-amino acid Schiff base acts as a tridentate O,N,O-Donor Ligand in a meridional binding mode. The N,N-donor heterocyclic base displays a chelating mode of bonding with a N-donor site trans to the oxo group. The complexes show a d−d band in the range of 680−710 nm in DMF with a shoulder near 840 nm. They exhibit an irreversible oxidative cyclic voltamm...
