EPR Analysis of Copper Exchanged and Encapsulated Copper (SALEN) Complex in Zeolite - Y

1994 ◽  
Vol 368 ◽  
Author(s):  
N Ulagappan ◽  
V Krishnasamy
Keyword(s):  
Copper Complex ◽  
Zeolite Y ◽  
Spin Hamiltonian Parameter ◽  
Epr Spectra ◽  
Spin Hamiltonian ◽  
Salen Complex ◽  
Hamiltonian Parameter

ABSTRACTCopper exchanged and copper-(salen) complex encapsulated in zeolite-Y were prepared. The encapsulaled complex was analysed by TGA, DRS and IR, which confirms the presence of complex in zeolite. Both copper materials were examined by EPR spectra, and the calculated spin-Hamiltonian parameter indicates the copper complex is more covalent in character than NaCu-Y.

The magnetic properties of the oxygen–hole aluminum centers in crystalline SiO2. II. [AlO4/H+]+ and [AlO4/Li+]+

1981 ◽  
Vol 59 (11) ◽  
pp. 1709-1718 ◽  
Author(s):  
R. H. D. Nuttall ◽  
J. A. Weil
Keyword(s):  
Magnetic Properties ◽  
Spin Hamiltonian Parameter ◽  
Spin Hamiltonian ◽  
Hole Trapping ◽  
Hamiltonian Parameter ◽  
Oxygen Hole ◽  
Charge Compensator ◽  
X Irradiation ◽  
Hyperfine Splittings ◽  
A Charge

The centers [AlO4/M+]+, formed in α-quartz by X-irradiation at 77 K, contain an aluminum ion substituted for a silicon ion, with an electron removed from a neighboring oxygen by the ionizing radiation. In addition, there is an interstitial ion M+ which acted as a charge compensator before the irradiation. Centers [AlO4/H+]+ and [AlO4/Li+]+ have been re-examined by EPR (at ca. 35 K), including measurement of small hyperfine splittings due to the compensator ions. The spin-Hamiltonian parameter matrices (i.e., [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text]) show that the hole-trapping oxygen in these species is linked via a "short" bond to aluminum (there are two different Si–O bond lengths in quartz). The probable positions of the compensating ions (Li+, H+) in a channel parallel to the crystallographic c-axis are reported.

Ethylsulfate Host Lattice Effects in the EPR Spectra of Gd3+ Ions

1972 ◽  
Vol 50 (10) ◽  
pp. 991-1001 ◽  
Author(s):  
H. A. Buckmaster ◽  
R. Chatterjee ◽  
Y. H. Shing
Keyword(s):  
Electric Field ◽  
Ionic Radius ◽  
Spin Hamiltonian Parameter ◽  
Host Lattice ◽  
Epr Spectra ◽  
Optical Data ◽  
Site Symmetry ◽  
Spin Hamiltonian ◽  
Crystalline Electric Field ◽  
Hamiltonian Parameters

Precision measurements and analysis have been made of the 290 °K, 10 GHz EPR spectra of the Gd3+ [4f7, 8S7/2] ion dilutely substituted (~5:103) into the C3h-site symmetry of the lanthanide host lattices Ln(C2H5SO4)3∙9H2O, where Ln ≡ La, Ce, Pr, Nd, Sm, Eu, Tb, Ho, Er, Tm, Yb, and Lu as well as Y which is chemically lanthanide-like. It is found that empirical, linear relationships exist between the magnitude of the Gd3+ spin-Hamiltonian parameter B20 and (i) the ionic radius of the lanthanide host; (ii) the unit cell dimensions of the host lattice; (iii) the molar volume of the host lattice; and (iv) the estimated crystalline potential parameter [Formula: see text]. A similar linear relationship is found between the ionic radius of the lanthanide host and B60 but not B40. These spin-Hamiltonian parameters are related theoretically to the crystalline electric field parameters through the perturbation interactions of the ground state with the excited states. It is concluded from a review of these interactions that the empirical relations reported in this paper cannot be explained using the values of the crystalline electric field parameters calculated from either excited state optical data or lattice summations. The EPR spin-Hamiltonian parameters for Gd3+ in the Y lattice confirm the latter's lanthanide behavior and assign it an effective ionic radius of (0.0896 ± 0.0001) nm which locates it very close to Ho, (0.0894 ± 0.0001) nm, confirming the results of Von Hevesy, Zachariasen et al., and Ketelaar.

Defect structure and formation of defect complexes in Cu2+-modified metal oxides derived from a spin-Hamiltonian parameter analysis

2009 ◽  
Vol 107 (19) ◽  
pp. 1981-1986 ◽  
Author(s):  
Rüdiger-A. Eichel ◽  
Michael D. Drahus ◽  
Peter Jakes ◽  
Ebru Erünal ◽  
Emre Erdem ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Defect Structure ◽  
Spin Hamiltonian Parameter ◽  
Parameter Analysis ◽  
Spin Hamiltonian ◽  
Defect Complexes ◽  
Hamiltonian Parameter

Metal-nitroxyl interactions. 37. Single-crystal EPR spectra of a spin-labeled copper complex containing an imine-urea linkage

1984 ◽  
Vol 23 (10) ◽  
pp. 1326-1330 ◽  
Author(s):  
Reddy Damoder ◽  
Kundalika M. More ◽  
Gareth R. Eaton ◽  
Sandra S. Eaton
Keyword(s):  
Single Crystal ◽  
Copper Complex ◽  
Epr Spectra

Monoclinic Spin Hamiltonian Analysis of EPR Spectra of Mn2+ in BiVO4 Single Crystals

1996 ◽  
Vol 198 (2) ◽  
pp. 839-851 ◽  
Author(s):  
T. H. Yeom ◽  
C. Rudowicz ◽  
S. H. Choh ◽  
D. G. McGavin
Keyword(s):  
Single Crystals ◽  
Epr Spectra ◽  
Spin Hamiltonian ◽  
Hamiltonian Analysis
Sign in / Sign up

Export Citation Format

Share Document