کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1410264 | 1501852 | 2009 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Two new one-dimensional luminescent silver(I) and lead(II) coordination polymers containing the flexible ligand 2-(1H-imidazole-1-yl)acetic acid Two new one-dimensional luminescent silver(I) and lead(II) coordination polymers containing the flexible ligand 2-(1H-imidazole-1-yl)acetic acid](/preview/png/1410264.png)
The free ligand, 2-(1H-imidazole-1-yl)acetate (Hima, 1), was crystallized from the mixture solution of 1. Two new coordination polymers, [Ag(Hima)(NO3)] (2) and {[Pb(Hima)2(NO3)](NO3)}n (3), are achieved by reaction of a flexible Hima, AgNO3 and Pb(NO3), respectively. In 2, the silver(I) atom is coordinated by four oxygen atoms from three carboxylate groups and one nitrate ion in a distorted tetrahedral environment. The free ligand Hima acts as the tridentate coordination mode, which bridges the silver atoms into a zigzag chain featuring a rare [Ag2(carboxylato-O,O′)(carboxylato-μ1,1-O)] six-membered ring. The intra-dimer Ag···Ag distance is 2.966(l) Å. In 3, Pb(II) atom exhibits an eight-coordinated dodecahedral coordination geometry, in which a unique 1-D chain structure with dicubane-like can be observed. In two polymers, the ligand Hima exhibits new and unique coordination modes. Solid-state fluorescence spectra reveal that the emission bands of complex 2 center at 462 and 510 nm (λex = 280 nm). In 3, the emission peaks locate at 465 and 547 nm upon excitation at 280 nm. In addition, they have been characterized by IR spectra and TG analysis.
Journal: Journal of Molecular Structure - Volume 938, Issues 1–3, 16 December 2009, Pages 291–298