Molecular structural identification of Cu(II) ion in Diaquamalonatozinc(II): Anisotropic behavior with low hyperfine coupling constant

Mithira, S.; Natarajan, B.; Deepa, S.; Ravikumar, R.V.S.S.N.; Rao, P. Sambasiva

doi:10.1016/j.molstruc.2006.11.002

Cited by 15 publications

(4 citation statements)

References 23 publications

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“…The analysis of the spectra give the lande splitting factor g|| = 2.368 and g⊥ = 2.118. Comparisons of g with the predicted value (g|| = 2.368 and g⊥ = 2.093) which is relatively good 40 . The anisotropy in g shows the presence of a low symmetry ligand field component.…”

Section: Resultssupporting

confidence: 55%

Spectral Characterization and Biological Studies on Mixed Ligand Complexes of Cr(III), Ni(II) and Cu(II) Derived from 3-Aminopyridine and Nitrite Ion

Dhaveethu¹,

Ramachandramoorthy²,

Thirunavukkarasu³

2014

Asian J. Chem.

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The biological activity of the aminopyridines and their transition metal complexes act as K + and Ca 2+ channel inhibitors has been discussed in the literature 1,2. 3-aminopyridine (3AP) possesses significant antiproliferative, antiinflammatory and antibacterial activities 3 and furthermore, an antitumor activity of its derivatives has also proposed 4. Metal aminopyridine complexes are generally used as asymmetric catalysts for various reactions such as hydrogenation, cyclopropanation, epoxidation etc 5. The versatile coordination modes of the ambidentate ligand nitrite ion (NO2-) were previously reported 6. Metal nitrito complexes (M-ONO) are in general used as photochemical NO precursors 7. The transition metal complexes have many applications in pharmaceutical industries, biology and medicine. They posses electrical, thermo chromic, catalytic, antibacterial and antifungal properties 8 , Metal complexes of chromium, nickel and copper have a wide range of applications such as dyes and pigments 9. Many drugs possess modified toxicological and pharmacological properties in the form of metal complexes and the most widely studied in this respect is the Cu(II) ion which has proved beneficial in many diseases such as tuberculosis, gastric ulcers, rheumatoid arthritis and cancers 10. Copper complexes are currently being investigated for their potential anticancer activity. Moreover, coordination with copper often enhances the activity of various types of drugs such as antitumor and antiinflammatory agents 11 .

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Section: Resultssupporting

confidence: 55%

Spectral Characterization and Biological Studies on Mixed Ligand Complexes of Cr(III), Ni(II) and Cu(II) Derived from 3-Aminopyridine and Nitrite Ion

Dhaveethu¹,

Ramachandramoorthy²,

Thirunavukkarasu³

2014

Asian J. Chem.

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“…The present value 0.780 indicates partially covalent nature for the metal ligand bond. Hence, admixture of d x2Ày2 and d 2 z orbital and covalency contribute to the low magnitude of the Cu(II) hyperfine constant[26][27][28][29][30][31][32].…”

mentioning

confidence: 99%

Molecular structural identification and position of Cu(II) ion in Diaqua(2,2′-bipyridine)malonatozinc(II): Spectroscopic studies

Parthipan

Rao

2010

Journal of Molecular Structure

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“…In order to identify the binding of Zn(II) with less steric ligand such as malonate ion in the complex diaquamalonatozinc(II); abbreviated hereafter as DAMZ, the present work has been undertaken. Single crystal EPR studies of Cu(II) and Mn(II) in DAMZ have been carried out and the results indicate substitutional replacement of zinc ion by the dopant [25,26]. In addition, the principal hyperfine value of copper nucleus shows admixture of the ground state with the excited state and the Mn(II) results confirm a large distortion from axial symmetry.…”

Section: Introductionmentioning

confidence: 94%

The substitutional occupation of vanadyl ion in diaquamalonatozinc(II)—single crystal EPR and powder optical studies

Natarajan¹,

Deepa²,

Mithira³

et al. 2007

Phys. Scr.

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Room temperature single crystal electron paramagnetic resonance (EPR) studies have been carried out on VO(II) doped diaquamalonatozinc(II) at X-band frequencies. The analysis of the data suggests the position of the vanadyl ion is substitutional replacing zinc ion. The spin Hamiltonian parameters g xx = 1.998, g yy = 1.960, g zz = 1.924 and A xx = 7.40, A yy = 6.63, A zz = 18.27 mT indicate that the symmetry around metal ion is no longer axial due to the substitution position of the impurity. The optical spectrum of the powder sample recorded at room temperature indicates three bands and the percentage of covalency of the metal-oxygen bond has been estimated as 22%. The admixture coefficients and bonding parameters have been calculated correlating EPR and optical data.

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Molecular structural identification of Cu(II) ion in Diaquamalonatozinc(II): Anisotropic behavior with low hyperfine coupling constant

Cited by 15 publications

References 23 publications

Spectral Characterization and Biological Studies on Mixed Ligand Complexes of Cr(III), Ni(II) and Cu(II) Derived from 3-Aminopyridine and Nitrite Ion

Spectral Characterization and Biological Studies on Mixed Ligand Complexes of Cr(III), Ni(II) and Cu(II) Derived from 3-Aminopyridine and Nitrite Ion

Molecular structural identification and position of Cu(II) ion in Diaqua(2,2′-bipyridine)malonatozinc(II): Spectroscopic studies

The substitutional occupation of vanadyl ion in diaquamalonatozinc(II)—single crystal EPR and powder optical studies

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