首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >An electron paramagnetic resonance study of spin site variations in Cu(hfac)_2 complexes with 5-(3-N-tert-butyl-N-aminoxylphenyl) pyrimidine
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An electron paramagnetic resonance study of spin site variations in Cu(hfac)_2 complexes with 5-(3-N-tert-butyl-N-aminoxylphenyl) pyrimidine

机译:电子顺磁共振研究Cu(hfac)_2与5-(3-N-叔丁基-N-氨基二甲苯基苯基)嘧啶配合物的自旋位点变化

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摘要

The X- and Q-band EPR spectra of coordination compounds of 5-(3-N-tert-butyl-N-aminoxylphenyl)pyrimidine (3PPN) with Cu(hfac)_2 show peaks in the g ≈ 2.3 region attributable to parallel component transitions of Cu(II) axially coordinated to pyrimidine, and in the g ≈ 2.0-2.2 region attributable to Cu(II) directly coordinated with the aminoxyl NO· radical unit plus perpendicular component transitions of the Cu(II) coordinated to pyrimidine. The spectral region with the Cu(II)-aminoxyl resonance can show temperature dependent behavior attributable to reversible Jahn-Teller distortions, analogous to behavior seen in Ovcharenko's "breathing crystal" Cu(II) complexes with nitronylnitroxides (e.g., Veber et al. (2008) [5]).
机译:5-(3-N-叔丁基-N-氨基苯甲酰基苯基)嘧啶(3PPN)与Cu(hfac)_2配位化合物的X和Q带EPR谱显示在g≈2.3区域有峰在轴向上与嘧啶配位的Cu(II)的跃迁,以及在归因于Cu(II)的g≈2.0-2.2区域中,直接与氨基氧基NO·自由基单元配位,以及与嘧啶配位的Cu(II)的垂直组分跃迁。具有Cu(II)-氨氧基共振的光谱区域可以显示归因于可逆Jahn-Teller畸变的温度依赖性行为,类似于Ovcharenko的“呼吸晶体” Cu(II)与亚硝酰硝基化物的配合物(例如Veber等人( 2008)[5])。

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