کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1331921 979022 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of synthesis condition on product formation: hydrothermal auto-oxidated synthesis of five copper halides with ratio of Cu(I)/Cu(II) in 1:1, 2:1, 3:1, 4:1 and 1:0
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Influence of synthesis condition on product formation: hydrothermal auto-oxidated synthesis of five copper halides with ratio of Cu(I)/Cu(II) in 1:1, 2:1, 3:1, 4:1 and 1:0
چکیده انگلیسی

The hydrothermal synthesis and structural characterization of five copper iodides derived from chelated ligands, 1, 10-phenanthroline (phen), ethylenediamine (en) and 1, 3-propanediamine, are reported. Except monovalent copper compound 1 ((phen)Cu3I31), other four compounds ([Cu(phen)2I][CuI2] 2, [Cu(phen)2I][Cu3I4] 3, [Cu(en)2][Cu4(phen)2I6] 4 and [Cu(1, 3-propanediamine)2][CuI2]25) are mixed-valent Cu(I)–Cu(II) compounds by partially auto-oxidated from Cu(I). Supramolecular frameworks of these compounds can be assembled by C/N–H⋯I hydrogen bonds, Cu(I)–Cu(I) interaction, weak Cu–I semicoordinate interaction, C–H⋯π and π–π stacking interactions. It's noteworthy that we find hydrothermal synthesis under higher pH value, higher synthesis temperature and longer reaction time can obtain higher ratio of Cu(I)/Cu(II) copper iodides and organic ligand with lower steric hinderance is prone to coordinated with divalent copper to form cation unit. Finally, the fluorescent study shows 1 exhibits intense orange–red luminescence with long lifetime at 293 K and more intense emission and longer lifetime at 77 K. Moreover, the room temperature EPR spectra of above five compounds not only show the valence of copper but demonstrate the coordination environment of Cu(II) centre.

The influence of hydrothermal synthesis condition on the ratio of Cu(I)/Cu(II) of five copper iodides, with 1:0, 1:1, 3:1, 4:1, 2:1, respectively, is deduced and the rivalrousness of 1,10-phenanthroline, ethylenediamine and 1, 3-propanediamine is discussed as well. The fluorescent study shows 1 exhibits intense orange-red luminescence with long lifetime (τ=1.25 μs) at 293 K and more intense emission and longer lifetime(τ=6.95 μs) at 77 K.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 181, Issue 12, December 2008, Pages 3327–3336
نویسندگان
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