Synthesis, characterization, and coordination chemistry of the 2-azaphenalenyl radical.
Synthesis, characterization, and coordination chemistry of the 2-azaphenalenyl radical.
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DOI：
10.1021/ja029236o
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发表时间：
2003-04
影响因子：
15
通讯作者：
Shijun Zheng;J. Lan;Saeed I. Khan;Y. Rubin
中科院分区：
文献类型：
--
作者：
Shijun Zheng;J. Lan;Saeed I. Khan;Y. Rubin
The 2-azaphenalenyl radical 2 has been synthesized and characterized by ESR spectroscopy. Variable-temperature ESR measurements were carried out on both the phenalenyl (1) and the 2-azaphenalenyl (2) radicals. The phenalenyl radical 1 has the known propensity to dimerize at temperatures below 20 degrees C, but unexpectedly less so than originally reported. The first experimental measurement of bond dissociation enthalpy for the dimerization of the phenalenyl radical 1 was obtained in CCl(4) (11.34 +/- 0.11 kcal/mol) and toluene (9.8 +/- 0.7 kcal/mol). The 2-azaphenalenyl radical 2 does not show a propensity to dimerize over the measurable temperature range (220-330 K), but does so in the presence of Cu(hfac)(2) (hfac = hexafluoroacetylacetonate). The latter complex was characterized by X-ray crystallography.
