New mono- and di-nuclear mixed complexes of cyanides and 2,3-bis(2′-pyridyl)pyrazine with ruthenium

被引：13

作者：

Posse, MEG ^{[1
]}

Fagalde, F ^{[1
]}

Vergara, MM ^{[1
]}

Katz, NE ^{[1
]}

机构：

[1] Univ Nacl Tucuman, Fac Bioquim Qum & Farmacia, Inst Quim Fis, RA-4000 San Miguel De Tucuman, Tucuman, Argentina

来源：

POLYHEDRON | 1998年 / 17卷 / 16期

关键词：

polypyridine complexes; dpp; ruthenium; pi-backbonding; mixed valence;

D O I：

10.1016/S0277-5387(98)00056-4

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The synthesis and spectroscopic, electrochemical and emissive properties,of a new mononuclear mixed complex, of formula. [Ru(dpp)(CN)(4)](2-) (dpp = 2,3-bis(2'-pyridyl)pyrazine are reported. The spectroscopic (IR, ,UV-visible, and emission) results demonstrate that dpp has a pi-acceptor capacity intermediate between bpy and bpz (bpy = 2,2'-bipyridine, bpz = 2,2'-bipyrazine),when coordinated to ruthenium cyanides: The redox potential of the Ru-II/Ru-III couple and the observed luminiscence at room temperature imply its possible use as a photosensitizer. Since dpp has also the extra ability, when compared to bpy, to form supramolecular complexes, new dinuclear complexes with dpp bridging Ru(CN)(4)(n-) (n = 1,2) moieties can also be obtained. The corresponding mixed-valent complex, [(CN)(4)Ru-II(dpp)Ru-III(CN)(4)](3-), has the characteristics of a Class (II) species, as disclosed by the weak interaction between both metallic centres; (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：2733 / 2738

页数：6

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