Naslov
EPR study of a copper impurity center in a single crystal of 2-thiothymine

Autori
Bešić, Erim ; Gomzi, Vjeran ; Sanković, Krešimir ; Herak, Janko N. ; Krilov, Dubravka

Izvornik
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy (1386-1425) 61 (2005), 13/14; 2803-2808

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
copper-thiothymine complex; EPR; 2-thiothymine

Sažetak
EPR spectroscopy was used to study the complex formed in crystals of 5-methyl-2-thiouracil (2-thiothymine) containing traces of copper. The copper impurities, originally present as Cu(I)-complex of 2-thiothymine in the lattice of 2-thiothymine, are transformed into paramagnetic Cu(II)-complex by ionizing radiation. It was found that the complex is planar, the plane being defined by two pairs of S and N atoms, from two adjacent 2-thiothymine molecules. The structure of the complex suggests that a pair of hydrogen bonds between two neighboring molecules is replaced by a stronger Cu-coordination bonding, with two sulfur and two nitrogen atoms as ligands. The spectroscopic parameters (g-tensor, A(63Cu) and A(14N) tensors) are essentially similar to those earlier observed for copper planar centers in other systems.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija, Biologija

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