EPR study of Mn(II)-doped CoH6CeMo12O42·12H2O: Host site symmetry and spin-lattice relaxation time

Thavasikani, Jeyabalan; Sami, Ponnusamy; Shunmugasundaram, A; Murugesan, R.

doi:10.1016/s1386-1425(99)00015-3

Cited by 13 publications

(3 citation statements)

References 24 publications

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“…The zero-field splitting in these ions is sensitive to small structural changes. Structural and spectral investigations of carboxylic acid complexes with metal ions have been performed by using EPR spectroscopy [7][8][9][10][11][12][13][14], since these complexes exist in widely different structures and exhibit features such as metal-metal interaction, hydrogen bonding and thermal decomposition behavior [15][16][17]. In the present study, an EPR and optical study of Mn(II) ions doped in dipotassium diaquabis(malonato-κ 2 O,O ) zincate dihydrate (hereafter abbreviated as PMZD) was carried out to obtain information about the possible location of Mn(II) ions in the lattice as substitutional or interstitial and to gain a better understanding of the physical interactions in the system.…”

Section: Introductionmentioning

confidence: 99%

Single-crystal electron paramagnetic resonance study of the interstitial position of Mn(II) in dipotassium diaquabis(malonato-κ²O,O′) zincate(II) dihydrate

Natarajan¹,

Mithira²,

Rao³

2011

Phys. Scr.

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A single-crystal electron paramagnetic resonance (EPR) spectroscopic investigation of Mn(II)-doped dipotassium diaquabis(malonato-κ 2 O,O ) zincate dihydrate has been carried out at X-band frequencies at 300 K. The EPR spectrum at room temperature exhibits more than 30 lines along a crystallographic axis, suggesting the presence of two types of impurities in the lattice. Single crystals, rotated along the three mutually orthogonal axes, have yielded the spin-Hamiltonian parameters g, A and D as g x x = 2.049, g yy = 2.005, g zz = 1.993; A x x = −9.17, A yy = −8.36, A zz = −8.06 mT; D x x = 31.55, D yy = 7.13, D zz = −38.68 mT, respectively. The other site, due to its low intensity, could not be followed during crystal rotations. The optical absorption spectrum contains characteristic bands of Mn(II) ions in distorted octahedral symmetry. From the observed optical spectrum, the crystal field parameters have been evaluated.

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Section: Introductionmentioning

confidence: 99%

Single-crystal electron paramagnetic resonance study of the interstitial position of Mn(II) in dipotassium diaquabis(malonato-κ²O,O′) zincate(II) dihydrate

Natarajan¹,

Mithira²,

Rao³

2011

Phys. Scr.

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“…Electron paramagnetic resonance (EPR) studies on the single crystals of paramagnetic ions doped in diamagnetic host lattices generally provide a detailed description of the nature of symmetry imposed by the ligands around paramagnetic ions [1,2]. The vanadyl ion has been used to study the symmetrical nature of paramagnetic ions in the crystal lattice, the bonding nature with the ligands [3][4][5] and the structural phase transitions of the host lattice, because it is the most stable oxy-cation among the paramagnetic transition metal ions [6][7][8][9][10][11][12][13][14][15][16][17][18]. Cadmium sodium sulphate hexahydrate (CSSH) lattice is selected to understand the nature of the vanadyl impurity.…”

Section: Introductionmentioning

confidence: 99%

Site determination of vanadyl impurity in cadmium sodium sulphate hexahydrate: single crystal EPR and optical studies

et al. 2006

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Electron paramagnetic resonance (EPR) and optical studies of VO(II) doped cadmium sodium sulphate hexahydrate (CSSH) are carried out at room temperature. The EPR spectra, recorded in the three orthogonal planes, indicate that the paramagnetic impurity has entered the lattice site both in substitutional and interstitial positions. The spin Hamiltonian parameters, calculated from the spectra for the two sites, are: site I: gxx=1.984, gyy=1.975, gzz=1.938; Axx=6.56, Ayy=7.50, Azz=18.61 mT; site II: gxx=1.982, gyy=1.978, gzz=1.940; Axx=6.88, Ayy=7.56, Azz=18.57 mT. The EPR spectrum of the powder sample also reveals the presence of two sites in the host lattice, suggesting that the two sites are chemically and magnetically inequivalent. The optical absorption spectrum exhibits three characteristic bands. Crystal field, tetragonal field, admixture coefficients and bonding parameters are evaluated, which suggest that the complex is fairly covalent in nature.

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“…respectively. Therefore, the anisotropies and hence the shapes of the powder spectra depend largely on D and E parameters, [11,12]. Cubic parameter was not determined because of its small value relative to other parameters.…”

Section: Introductionmentioning

confidence: 99%

Mn+2 katkılı [Mn(acs)2(H20)4] Asesülfam Metal Kompleksinin Epr Spektroskopisi ile İncelenmesi

Kocakoç

İçbudak

Tapramaz

2020

Sinop Üniversitesi Fen Bilimleri Dergisi

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In this study, the structure of Mn +2 doped [Mn(acs)2(H2O)4] acesulfame metal complex was investigated by EPR spectroscopy. Transition metal ion complexes have important applications in both science and technology. Some of these complexes are formed using paramagnetic metal ions Mn +2 , VO +2 , Cu +2 , Fe +3 , Cr +3 and therefore are analyzed with EPR spectroscopy to provide structural information. The synthetic sweetener acesulfame is widely used in food and medicine and has widely used in cosmetics. The reason for widespread use depends basically on that acesulfame is easily digested and is not deposited in the body. In addition, acesulfame used as ligands in transition metal complexes show thermochromic and solvatochromic properties. In this study, mixed ligand complex Mn(acs)2(H2O)4 was produced and crystallized and examined with EPR spectroscopy. Structure of the complex and behaviors at different temperatures were discussed.

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EPR study of Mn(II)-doped CoH6CeMo12O42·12H2O: Host site symmetry and spin-lattice relaxation time

Cited by 13 publications

References 24 publications

Single-crystal electron paramagnetic resonance study of the interstitial position of Mn(II) in dipotassium diaquabis(malonato-κ²O,O′) zincate(II) dihydrate

Single-crystal electron paramagnetic resonance study of the interstitial position of Mn(II) in dipotassium diaquabis(malonato-κ²O,O′) zincate(II) dihydrate

Site determination of vanadyl impurity in cadmium sodium sulphate hexahydrate: single crystal EPR and optical studies

Mn+2 katkılı [Mn(acs)2(H20)4] Asesülfam Metal Kompleksinin Epr Spektroskopisi ile İncelenmesi

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EPR study of Mn(II)-doped CoH6CeMo12O42·12H2O: Host site symmetry and spin-lattice relaxation time

Cited by 13 publications

References 24 publications

Single-crystal electron paramagnetic resonance study of the interstitial position of Mn(II) in dipotassium diaquabis(malonato-κ2O,O′) zincate(II) dihydrate

Single-crystal electron paramagnetic resonance study of the interstitial position of Mn(II) in dipotassium diaquabis(malonato-κ2O,O′) zincate(II) dihydrate

Site determination of vanadyl impurity in cadmium sodium sulphate hexahydrate: single crystal EPR and optical studies

Mn+2 katkılı [Mn(acs)2(H20)4] Asesülfam Metal Kompleksinin Epr Spektroskopisi ile İncelenmesi

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Single-crystal electron paramagnetic resonance study of the interstitial position of Mn(II) in dipotassium diaquabis(malonato-κ²O,O′) zincate(II) dihydrate

Single-crystal electron paramagnetic resonance study of the interstitial position of Mn(II) in dipotassium diaquabis(malonato-κ²O,O′) zincate(II) dihydrate