Crystallography and magnetism of two 1-(4-nitroxylphenyl)pyrroles

被引:17
作者
Delen, Zeynep [1 ]
Lahti, Paul M. [1 ]
机构
[1] Univ Massachusetts, Dept Chem, Amherst, MA 01003 USA
关键词
D O I
10.1021/jo0616299
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Stable radicals 1-(4-(N-tert-butyl-N-aminoxyl)phenyl)pyrrole (BNPP) and 1-(4-(N-[para-methoxyphenyl]-N-aminoxyl)phenyl)pyrrole (MNPP) were synthesized and characterized by crystallography and magnetism. BNPP crystals exhibit 1- D chains of intermolecular nitroxide NO to nitroxide CH3 contacts, but polycrystalline magnetic susceptibility measurements show quite small antiferromagnetic (AFM) exchange interactions. MNPP shows stronger AFM exchange interactions that appear to be associated with a 2-D planar mesh of crystallographic nitroxide to nitroxide (N)O center dot center dot center dot N(O) contacts of 4.0-4.2 angstrom. The AFM behavior of MNPP can be fitted to a 2-D square planar Heisenberg antiferromagnetic exchange model with J/k = (-)0.78 +/- 0.04 K and mean field constant theta = (-)0.77 +/- 0.12 K.
引用
收藏
页码:9341 / 9347
页数:7
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