The Re(I) coordination chemistry of a series of pyrido[2,3-b]pyrazine-derived ligands: Syntheses, characterisation and crystal structures
The Re(I) coordination chemistry of a series of pyrido[2,3-b]pyrazine-derived ligands: Syntheses, characterisation and crystal structures
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一系列吡啶并[2,3-b]吡嗪衍生配体的 Re(I) 配位化学：合成、表征和晶体结构
DOI：
10.1016/j.poly.2009.11.013
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发表时间：
2010
期刊：
影响因子：
2.6
通讯作者：
Simon J. A. Pope
中科院分区：
文献类型：
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作者：
B. R. Yeo;A. Hallett;B. Kariuki;Simon J. A. Pope
在乙醇中，2,3-二氨基吡啶与一个功能化邻二酮的等价物反应，产生一系列基于吡啶[2,3-b]吡嗪核心的配体。通过1H，13C - {1H} NMR， MS和UV-Vis光谱对配体进行了表征。配体与{ReBr(CO)5}的一个等价物反应，得到一系列基于通式face -{ReBr(CO)3(L)}（其中L=吡啶[2,3-b]吡嗪衍生配体，L1-L6）的re - n配合物。溶液IR研究证实了面盖三羰基配位几何在铼上的保留，1h NMR研究证实了配体与Re(I)的配位。获得了每个配合物的EI HR MS数据，确认了所建议的配方和化学计量。其中三种配合物（Re- l1, Re- l2, Re- l6）的x射线单晶结构均表明配体通过一个四元螯合环与Re(I)以双齿方式配位，而在前两种情况下，这是不对称的。配合物的电子吸收光谱显示在375 ~ 500nm的可见光区吸收（配合物外观呈橙红色）。在350 ~ 450nm辐照后，配合物在600 ~ 700nm之间表现出固态宽发射峰。该配合物在溶液中没有足够的发光，因此无法进一步研究该发射带的起源，尽管参考相关的Re(I)的1,8-萘啶配合物，它可能包含显著的3mlct特征。
Reaction of 2,3-diaminopyridine with one equivalent of a functionalised vicinal diketone, in ethanol, yields a series of ligands based upon the pyrido[2,3-b]pyrazine core. The ligands were characterised by1H,13C–{1H} NMR, MS and UV–Vis spectroscopy. Reaction of the ligands with one equivalent of {ReBr(CO)5} gave a series of Re-Lncomplexes based upon the general formula fac-{ReBr(CO)3(L)} (where L=pyrido[2,3-b]pyrazine-derived ligands, L1–L6). Solution IR studies confirmed the retention of the facially capped, tri-carbonyl coordination geometry at rhenium, and1H NMR studies confirmed coordination of the ligand to Re(I). EI HR MS data were obtained for each complex confirming the proposed formulation and stoichiometry. Single crystal X-ray structures were obtained for three of the complexes (Re-L1, Re-L2, Re-L6), with each demonstrating that the ligands coordinate to Re(I) in a bidentate manner, via a four-membered chelate ring, which was unsymmetrical in the former two cases. The electronic absorption spectra of the complexes showed absorption into the visible region ca. 375–500nm, (the complexes are orange-red in appearance). Following irradiation at 350–450nm, the complexes display a solid-state broad emission peaking between 600–700nm. The complexes were not sufficiently luminescent in solution to allow further investigation into the origin of this emission band, although with reference to related 1,8-naphthyridine complexes of Re(I) it is likely to incorporate significant3MLCT character.
影响因子：
--
作者：
M. Coogan;V. Fernández‐Moreira;B. Kariuki;Simon J. A. Pope;Flora L Thorp-Greenwood
通讯作者：
M. Coogan;V. Fernández‐Moreira;B. Kariuki;Simon J. A. Pope;Flora L Thorp-Greenwood
影响因子：
4.9
作者：
Hallett, Andrew J.;Christian, Paul;Pope, Simon J. A.
通讯作者：
Pope, Simon J. A.
抗有丝分裂剂：一些吡啶衍生物的结构活性研究。
影响因子：
7.3
作者：
TempleJr,C;Rener,GA;Waud,WR;Noker,PE
通讯作者：
Noker,PE