Now showing items 1-7 of 7
Abstract: | In the title molecule, C16H11N5, the mean planes of the quinoxaline and indazole fragments form a dihedral angle of 10.62 (5). In the crystal, weak intermolecular N—H..........N hydrogen bonds link the molecules into zigzag chains extending in the [001] direction. The crystal packing also exhibits pye interactions [centroid–centroid distances of 3.7080 (2) and 3.8220 (5) A ˚ ], which form stacks of the molecules parallel to the a axis |
URI: | http://dyuthi.cusat.ac.in/purl/1649 |
Files | Size |
---|---|
leeju.pdf | (199.0Kb) |
Abstract: | In the molecule of the title compound, C20H16N6, the central C—C bond lies on a crystallographic inversion centre. The quinoxalidine ring is nearly planar, with a maximum deviation of 0.021 (2) A ˚ from the mean plane. The crystal structure is stabilized by intermolecular C—H....N interactions, leading to the formation of a layer-like structure, which extends along the a axis |
URI: | http://dyuthi.cusat.ac.in/jspui/handle/dyuthi/1642 |
Files | Size |
---|---|
Acta E Digna.pdf | (313.7Kb) |
Abstract: | This thesis is mainly concerned with the synthesis and characterisation of new simple and zeolite encapsulated transition metal (manganese(II),nickel(II),and copper(II)complexes of quinoxaline based double Schiff base ligands.Theses ligands are N,N'-bis(quinoxaline-2-carboxalidene)hydrazine,N,N'-bis(quinoxaline-2-carboxalidene)-1,2-diaminoethane,N,N'-bis(quinoxaline-2-carboxalidene)-1,3-diamonopropane,N,N'-bis(quinoxaline-2-carboxalidene)-1,4-diaminobutane,N,N'-bis(quinoxaline-2-carboxalidene)-1,2-diaminocyclohexane and N,N'-bis(quinoxaline-2-carboxalidene)-1,2-diaminobenzene.The Schiff base ligands have been characterised by spectral and single crystal XRD studies.Theses ligands provide great structural diversity during complexation.Mn(II) and Ni(II) form octahedral with these Schiff bases,whereas Cu(II) forms both octahedral and tetrahedral complexes.Studies on the biological and Catalytic activity of the copper(ll) complexes are also presented in this thesis. |
Description: | Dept.of Applied Chemistry,Cochin University of Science and Technology |
URI: | http://dyuthi.cusat.ac.in/purl/2936 |
Files | Size |
---|---|
Dyuthi-T0927.pdf | (10.36Mb) |
Abstract: | The mononuclear cobalt(II) complex [CoL2] H2O (where HL is quinoxaline-2-carboxalidine- 2-amino-5-methylphenol) has been prepared and characterized by elemental analysis, conductivity measurement, IR, UV-Vis spectroscopy, TG-DTA, and X-ray structure determination. The crystallographic study shows that cobalt(II) is distorted octahedral with each tridentate NNO Schiff base in a cis arrangement. The crystal exhibits a 2-D polymeric structure parallel to [010] plane, formed by O-H...N and O-H... O intermolecular hydrogen bonds and pye stacking interactions, as a racemic mixture of optical enantiomers. The ligand is a Schiff base derived from quinoxaline-2-carboxaldehyde |
URI: | http://dyuthi.cusat.ac.in/jspui/handle/dyuthi/1638 |
Files | Size |
---|---|
665515_758077589_915864698.pdf | (576.1Kb) |
Abstract: | An efficient one-pot synthesis of two new heterocyclic perimidines 4-(2,3-dihydro-1H-perimidin-2-yl)-2-methoxyphenol and 2-(quinoxalin-2-yl)-2,3-dihydro-1H-perimidine in good yields is presented. This methodology provides a simple, straightforward synthetic route to these interesting classes of heterocycles. Crystal structure, solvatochromism and antibacterial activity of these organic compounds are discussed. |
URI: | http://dyuthi.cusat.ac.in/purl/1640 |
Files | Size |
---|---|
tet let varsha.pdf | (437.1Kb) |
Abstract: | The Schiff base compounds N,N0-bis[(E)-quinoxalin-2-ylmethylidene] propane-1,3-diamine, C21H18N6, (I), and N,N0-bis[(E)- quinoxalin-2-ylmethylidene]butane-1,4-diamine, C22H20N6, (II), crystallize in the monoclinic crystal system. These molecules have crystallographically imposed symmetry. Compound (I) is located on a crystallographic twofold axis and (II) is located on an inversion centre. The molecular conformations of these crystal structures are stabilized by aromatic pye stacking interactions. |
URI: | http://dyuthi.cusat.ac.in/jspui/handle/dyuthi/1641 |
Files | Size |
---|---|
Acta Cryst. (2009). C65, o612_o614.pdf | (390.4Kb) |
Abstract: | The asymmetric unit of the title compound, C11H8N4, contains two independent molecules. In the crystal structure, intermolecular N—H.....N hydrogen bonds link molecules into ribbons extended in the [100] direction |
URI: | http://dyuthi.cusat.ac.in/purl/1643 |
Files | Size |
---|---|
acta e varsha.pdf | (213.4Kb) |
Now showing items 1-7 of 7
Dyuthi Digital Repository Copyright © 2007-2011 Cochin University of Science and Technology. Items in Dyuthi are protected by copyright, with all rights reserved, unless otherwise indicated.