An ESR study of UV-irradiated solutions of tetramethylammonium mercaptoundecahydro-closo-dodecaborate(2-) at 77K

[img]PDF - Authorized users only
Language: English
173Kb
Title:An ESR study of UV-irradiated solutions of tetramethylammonium mercaptoundecahydro-closo-dodecaborate(2-) at 77K
Creators:
Stopka, Pavel
Štrouf, Oldřich
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 56, 3, pp. 657-662

Abstract

The superoxide anion-radicals O<sub>2</sub><sup>·-</sup> are generated by the ultraviolet irradiation of air- or oxygen-saturated aqueous solutions of tetramethylammonium mercaptoundecahydro-<i>closo</i>-dodecaborate<sup>(2-)</sup> at 77 K. The superoxide anion-radicals are formed from the oxygen molecule coordinated on the mercaptoundecahydro-<i>closo</i>-dodecaborate dianion. In the absence of this dianion no O<sub>2</sub><sup>·-</sup> are generated. By the irradiation in the presence of hydrogen peroxide the formation of the superoxide anion-radicals is more intensive than in the presence of oxygen only. Simultaneously with O<sub>2</sub><sup>·-</sup> generation the corresponding thiol radicals are formed. These radicals give the disulfide compound [B<sub>12</sub>H<sub>11</sub>S]<sub>2</sub><sup>4-</sup>. A possible role of sulfur-centered radicals in the autoxidation transformations of the mercaptoundecahydro-<i>closo</i>-dodecaborate dianion is discussed.

Title:An ESR study of UV-irradiated solutions of tetramethylammonium mercaptoundecahydro-closo-dodecaborate(2-) at 77K
Creators:
Stopka, Pavel
Štrouf, Oldřich
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:56
Number:3
Page Range:pp. 657-662
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc19910657UNSPECIFIED
ID Code:4980
Item Type:Article
Deposited On:22 Feb 2010 11:27
Last Modified:22 Feb 2010 10:28

Citation

Stopka, Pavel; Štrouf, Oldřich (1991) An ESR study of UV-irradiated solutions of tetramethylammonium mercaptoundecahydro-closo-dodecaborate(2-) at 77K. Collection of Czechoslovak Chemical Communications, 56 (3). pp. 657-662. ISSN 0010-0765

Repository Staff Only: item control page