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21.
Kalagouda B. Gudasi Siddappa A. Patil Ramesh S. Vadavi Rashmi V. Shenoy Munirathinam Nethaji 《Transition Metal Chemistry》2006,31(5):586-592
A new 1,2-dihydroquinazolin-4(3H)-one ligand, 2-[2-hydroxy-3-methoxyphenyl]-3-[2-hydroxy-3-methoxybenzylamino]-1,2-dihydroquinazolin-4(3H)-one
(Hmpbaq), formed by the condensation of 2-aminobenzoylhydrazide with 2-hydroxy-3-methoxybenzaldehyde and its copper(II), nickel(II),
cobalt(II), manganese(II), zinc(II) and cadmium(II) complexes, have been synthesized. Their structures have been elucidated
on the basis of elemental analyses, conductance measurements, magnetic moments, spectral (i.r., 1H-n.m.r., u.v.–vis., e.p.r. and FAB-mass) and thermal studies. The formation of 1,2-dihydroquinazolin-4(3H)-one rather than
hydrazone in the reaction of 2-aminobenzoylhydrazide with 2-hydroxy-3-methoxybenzaldehyde is confirmed by the 1H-n.m.r. spectra and single crystal X-ray diffraction studies. The tridentate behavior of the ligand was proposed on the basis
of spectral studies. X-band e.p.r. spectra of the copper(II) and manganese(II) complexes in the polycrystalline state at room
temperature and liquid nitrogen temperature were recorded and their salient features are reported. Thermal stabilities of
the manganese(II) and zinc(II) complexes have been studied. 相似文献
22.
Kalagouda B. Gudasi Ramesh S. Vadavi Rashmi V. Shenoy Siddappa A. Patil Munirathinam Nethaji 《Transition Metal Chemistry》2006,31(1):135-145
The synthesis of a new ligand 2-pyridine-2-yl-3(pyridine-2-carboxylideneamino)-quinazolin-4(3H)-one (PPCAQ) is described together
with its manganese(II), cobalt(II), nickel(II), copper(II), zinc(II) and cadmium(II) complexes. The single crystal X-ray diffraction
studies of the ligand reveal the presence of two crystallographically independent molecules in asymmetric unit cell, which
exhibit N…N attractive interaction. The PPCAQ and its metal complexes were characterized by analytical, spectroscopic (i.r.,
n.m.r and u.v.–vis), magnetic moment, conductance and thermal studies. The i.r. spectral studies reveal the ligational diversity
of the PPCAQ towards different metal ions as NNN donor in cobalt(II), copper(II), zinc(II) and cadmium(II) complexes and as
ONN donor in manganese(II) and nickel(II) complexes. The antimicrobial activity of all the compounds was tested; copper(II),
zinc(II) and cadmium(II) complexes show enhanced antibacterial activity compared to the free ligand. 相似文献
23.
Kalagouda B. Gudasi Siddappa A. Patil Manohar V. Kulkarni Munirathinam Nethaji 《Transition Metal Chemistry》2009,34(3):325-330
A new heterocycle, namely 2-(furyl)-3-(furfuralimino)-1,2-dihydroquinazolin-4(3H)-one (ffdq) was formed by the condensation
of 2-aminobenzoylhydrazide with furfural and characterized by physico-chemical, spectroscopic, and single crystal X-ray diffraction
studies. A series of complexes of ffdq have been synthesized and characterized by physico-chemical, spectroscopic, and thermal
studies. According to the i.r. and 1H-n.m.r. spectra ffdq behaves as a bidentate ligand coordinating through quinazoline oxygen and azomethine nitrogen. The FAB-mass
spectrum of the Cd(II) complex indicates the monomeric nature of this complex. The X-band e.p.r. spectrum of the Cu(II) complex
and thermal stabilities of the Co(II) and Ni(II) complexes are discussed. 相似文献
24.
Sunil M. Patil Ramesh S. Vadavi Suneel Dodamani Umashri Kendur Geeta Chimmalagi Sunil Jalalpure Christopher S. Frampton Kalagouda B. Gudasi 《Transition Metal Chemistry》2018,43(1):65-72
Mononuclear Co(III), Ni(II) and Cu(II) coordination compounds of (E)-1-(3,5-di-tert-butyl-2-hydroxybenzylidene)-2-(phthalazin-1-yl)hydrazine (LH) were prepared and characterized by physicochemical and spectroscopic methods. The metal-to-ligand ratio was found to be 1:2 in [Co(L)2]Cl·2H2O (1) and [Ni(L)2]·2H2O (2), while it is 1:1 in [Cu(L)Cl]·2CH3OH (3). The X-ray crystal structures of LH and complex 1 is are reported. LH shows monobasic behavior, coordinating through NNO donor atoms. The complexes were investigated for their antimicrobial properties. Complexes 1 and 3 show excellent antibacterial and antifungal activities, respectively. 相似文献