Cation Binding to Xanthorhodopsin: Electron Paramagnetic Resonance and Magnetic Studies

2017 ◽  
Vol 121 (17) ◽  
pp. 4333-4340 ◽  
Author(s):  
Elena Smolensky Koganov ◽  
Gregory Leitus ◽  
Rinat Rozin ◽  
Lev Weiner ◽  
Noga Friedman ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Cation Binding ◽  
Magnetic Studies ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

scholarly journals Influence of the Substituted Ethylenediamine Ligand on the Structure and Properties of [Cu(diamine)2Zn(NCS)4]∙Solv. Compounds

Crystals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 637
Author(s):  
Natalia Tereba ◽  
Tadeusz M. Muzioł ◽  
Robert Podgajny ◽  
Grzegorz Wrzeszcz
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Magnetic Interaction ◽  
Structural Features ◽  
Molecular Formula ◽  
Structure And Properties ◽  
Magnetic Studies ◽  
Paramagnetic Resonance ◽  
X Ray ◽  
Ethylenediamine Ligand ◽  
Electron Paramagnetic

In this paper, three new heterometallic compounds were described and compared with the molecular formula [Cu(pn)2Zn(NCS)4] (1), [Cu(N,N-Me2-en)2Zn(NCS)4] (2), [Cu(N-Me-en)2Zn(NCS)4]∙½H2O (3) where pn = 1,2−diaminopropane, N,N-Me2-en = N,N‒dimethylethylenediamine and N-Me-en = N-methylethylenediamine, respectively. The compounds mentioned above were characterized by elemental analysis, infrared (IR), electronic, electron paramagnetic resonance (EPR) spectra, and magnetic studies. Crystal structures for 1 and 2 were determined by X-ray analysis. Copper(II) in these complexes adopts 4 + 2 coordination with two elongated (in 2 very long and considered as semi-coordination) Cu-S bonds. The Cu-N and Cu-S bond lengths depend on substituent position affecting steric hindrance and hence a topology of the chain. Both chains form different zigzag patterns characterized by one or two Cu-Zn distance values. Weak magnetic interaction is observed, ferromagnetic in the case of 1 and antiferromagnetic in the case of 2, due to diversity of the above structural features.

Electron paramagnetic resonance, optical and magnetic studies of Tb 3+ in lanthanide nicotinate dihydrates

1987 ◽  
Vol 413 (1845) ◽  
pp. 515-528 ◽  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Optical Absorption ◽  
Ground State ◽  
Zeeman Effect ◽  
Optical Absorption Spectroscopy ◽  
Site Symmetry ◽  
Magnetic Studies ◽  
Paramagnetic Resonance ◽  
Defect Sites ◽  
Electron Paramagnetic

Optical absorption and fluorescence, magnetic susceptibility and electron magnetic resonance experiments have been made of Tb 3+ , 4f 8 , ions in lanthanide nicotinate dihydrate single crystals. Optical absorption spectroscopy in undiluted terbium nicotinate dihydrate (TbND) indicates that the ground state of Tb 3+ , 7 F 6 , is a singlet exhibiting a quadratic Zeeman effect, and this is confirmed by the observation of a temperature-independent Van Vleck paramagnetism below 4.2 K. This is what one would expect for a non-Kramers ion in a crystal field of no symmetry. In spite of this, electron paramagnetic resonance (epr) is observed from Tb 3+ ions both in dilute LaND containing 0.01 mole fraction of Tb and in TbND. In the dilute material, in spite of the absence of site symmetry, the results show a nearly degenerate non-Kramers doublet with a g value of 17.2(8), close to the maximum possible value of 12 g j ; the ground state must therefore be predominantly M j = ±6. The epr in TbND arises from some type of defect site involving two interacting dissimilar Tb 3+ ions. The spectrum of Tb 3+ ions observed by optical fluorescence is also attributed to defect sites.

Synthetic, X-ray Structure, Electron Paramagnetic Resonance, and Magnetic Studies of the Manganese(II) Complex of 1-Thia-4,7-diazacyclononane ([9]aneN2S)

1996 ◽  
Vol 35 (4) ◽  
pp. 1039-1044 ◽  
Author(s):  
Lawrence R. Gahan ◽  
Vincent A. Grillo ◽  
Trevor W. Hambley ◽  
Graeme R. Hanson ◽  
Clifford J. Hawkins ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Magnetic Studies ◽  
Paramagnetic Resonance ◽  
X Ray ◽  
Electron Paramagnetic

Magnetic resonance, optical and magnetic studies of the nicotinate dihydrates of dysprosium and erbium

1991 ◽  
Vol 434 (1892) ◽  
pp. 695-706 ◽  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Magnetic Resonance ◽  
Ground State ◽  
Zeeman Effect ◽  
Dipole Interaction ◽  
Nearest Neighbour ◽  
Magnetic Studies ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic ◽  
Made In

Measurements have been made in lanthanide nicotinate dihydrate (LnND) single crystals, where Ln ═ Dy and Er, of optical absorption, including the Zeeman effect, of magnetic susceptibility between 1.4 and 4.2 K, of electron paramagnetic resonance between about 9 and 35 GHz, and of magnetic resonance at 22 MHz. As in the case of TmND (Baker et al . 1986 a ), the measurements are consistent with a ground state with a large amplitude of M j ═ ± J , an almost Ising-like g -matrix, and a purely magnetic dipole-dipole interaction between nearest-neighbour Ln 3+ ions. In this respect, the Kramers ions Dy 3+ and Er 3+ exhibit features similar to the non-Kramers ions Tb 3+ and Tm 3+ in the nicotinate dihydrates.

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