EVALUATION OF POTENTIAL FERROMAGNETIC COUPLING UNITS - THE BIS(TMM) APPROACH TO HIGH-SPIN ORGANIC-MOLECULES

被引：103

作者：

JACOBS, SJ ^{[1
]}

SHULTZ, DA ^{[1
]}

JAIN, R ^{[1
]}

NOVAK, J ^{[1
]}

DOUGHERTY, DA ^{[1
]}

机构：

[1] CALTECH,ARNOLD & MABEL BECKMAN LABS CHEM SYNTH,PASADENA,CA 91125

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 1993年 / 115卷 / 05期

关键词：

D O I：

10.1021/ja00058a020

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Four new hydrocarbon tetraradicals, 1-4, each composed of two triplet trimethylenemethane (TMM) subunits finked by a potential ferromagnetic coupling unit (FC), were synthesized and characterized by variable-temperature electron paramagnetic resonance (EPR) spectroscopy. Simulation of the EPR powder spectra and a priori calculation of the zero-field splitting parameters aided spectral assignment. The Heisenberg Hamiltonian appears to quantitatively model relative spin-state energies in 1-4. In three cases ferromagnetic coupling was achieved, as evidenced by quintet ground states in the resulting tetraradicals. In one case, strong evidence for antiferromagnetic coupling was obtained.

引用

页码：1744 / 1753

页数：10

共 114 条

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