کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1311578 975334 2008 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Chemistry of selenium and tellurium with tetrachelate and macrocyclic ligands
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Chemistry of selenium and tellurium with tetrachelate and macrocyclic ligands
چکیده انگلیسی

Treatment of meso(tetra-p-tolyl)porphryin, H2(TTP), or Li2(TTP) with OSeCl2 or OSe(NMe2)2 in toluene or THF resulted in the formation of the diprotonated porphyrin, [H4(TTP)]Cl2 and indicated the reluctance of selenium to insert into the porphyrin core. The molecular structure of [H4(TTP)]Cl2 was determined by single-crystal X-ray diffraction and exhibited the typical saddle-shape distortion of diprotonated porphyrins. The molecular structure of (p-MeO–Ph)2Te(salen) was reexamined by X-ray diffraction. The geometry of the Te(IV) center is strongly influenced by a stereochemically active lone pair and is best described as having an AX4E disphenoid structure in which the salen oxygen atoms occupy axial positions and the two anisyl ligands reside in equatorial sites. Distances between Te and the salen nitrogen atoms are 2.852(3) and 2.984(3) Å and are largely nonbonding.

Oxo and diaryl derivatives of Se(IV) and Te(IV) are reluctant to bind all donor atoms of tetrachelate ligands. The molecular structure of (p-MeO–Ph)2Te(salen) reveals the coordination preference of Te(IV).Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Inorganica Chimica Acta - Volume 361, Issue 11, 27 July 2008, Pages 3079–3083
نویسندگان
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