Pd2Ag triangle supported by two mu(3)-amidopyridine ligands

Shen WZ; Costisella B; Lippert B

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Pd2Ag triangle supported by two mu(3)-amidopyridine ligands

机译：由两个mu（3）-ami啶配体支持的Pd2Ag三角形

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[Pd(tmeda)(Hampy-N')(H2O)](2+) (tmeda = N,N,N',N'-tetramethylethylenediamine; Hampy = 2-aminopyridine) forms in the presence of Ag+ at pH 8-9 a triangular Pd2Ag complex containing two deprotonated ampy(-) ligands. It has been crystallized and structurally characterized with nitrate anions and a second co-crystallized AgNO3, [{Pd(ampy)(tmeda)}(2)Ag(mu-NO3)(2)Ag(NO3)(2)] (5). The two amidopyridine ligands are triply bridging, binding to Ag+ in a monodentate fashion via N', and to two Pd-II centres in a mu(2)-bridging fashion via the monodeprotonated N-2 position. The resulting four-membered Pd(ampy)(2)Pd metallacycle is syn-planar with Pd center dot center dot center dot Pd separations of 3.0878(13) angstrom. The Pd center dot center dot center dot Ag distances are 3.0879(14) angstrom in 5 (isosceles triangle). In solution (D2O), the two ampy- ligand in 5 are non-equivalent as concluded from a detailed H-1 NMR spectroscopic study and confirmed by a C-13 NMR spectrum. Removal of Ag+ from 5, as achieved by addition of Cl-, causes cluster degradation and linkage isomerization of Pd-II(tmeda) from the exocyclic N-2 to the endocyclic N-1 position.

机译：[Pd（tmeda）（Hampy-N'）（H2O）]（2+）（tmeda = N，N，N'，N'-四甲基乙二胺; Hampy = 2-氨基吡啶）在pH 8的Ag +存在下形成9是包含两个去质子化的ampy（-）配体的三角形Pd2Ag复合物。它已经通过硝酸根阴离子和第二种共结晶的AgNO3 [[Pd（ampy）（tmeda）}（2）Ag（mu-NO3）（2）Ag（NO3）（2）]进行了结晶和结构表征。（5 ）。两个酰胺基吡啶配体三重桥接，通过N'以单齿方式与Ag +结合，并通过单去质子化的N-2位置以mu（2）桥接方式与两个Pd-II中心结合。所得的四元Pd（ampy）（2）Pd金属环与Pd中心点中心点中心点Pd间隔为3.0878（13）埃同平面。 Pd中心点中心点中心点Ag的距离为5（等腰三角形）为3.0879（14）埃。在溶液（D2O）中，由详细的H-1 NMR光谱研究得出结论，并通过C-13 NMR光谱证实，5中的两个安培配体是不等价的。通过添加Cl-将Ag +从5中除去，导致簇降解和Pd-II（tmeda）从环外N-2到环内N-1位置的键异构化。

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《Dalton transactions: An international journal of inorganic chemistry》 |2007年第8期|共8页
作者
Shen WZ; Costisella B; Lippert B;
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正文语种 eng
中图分类无机化学;
关键词
MOLECULAR-STRUCTURE; CRYSTAL-STRUCTURE; CYCLIC TRIMER; COMPLEXES; 2-AMINOPYRIDINE; PLATINUM(II); AMINOPYRIDINE; HETEROCYCLES; OLIGONUCLEOTIDES; NUCLEOSIDES;

机译：分子结构;晶体结构;循环三聚体;络合物;2-氨基吡啶;铂（II）;氨基吡啶;杂环;寡核苷酸;核苷;

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Pd2Ag triangle supported by two mu(3)-amidopyridine ligands

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