کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1336842 1500238 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis, crystal structures and conducting properties of heteroleptic nickel(II) 1,1-dithiolate-bpy/dppe ligand complexes
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Synthesis, crystal structures and conducting properties of heteroleptic nickel(II) 1,1-dithiolate-bpy/dppe ligand complexes
چکیده انگلیسی

New heteroleptic complexes, [Ni(LL′)] (L = 2-(methylene-1,1′-dithiolato)-5,5′-dimethylcyclohexane-1,3-dione (L1), L′ = 2,2′-bipyridyl (bpy) 1; L = 2-(methylene-1,1′-dithiolato)-1,3-indandione (L2), L′ = 1,2-bis(diphenylphosphino)ethane (dppe) 2) have been synthesized and characterized by elemental analysis, IR, NMR and UV–Vis spectroscopy, and their structures have been determined crystallographically. In the two structures, the Ni atom lies at the centre of a distorted square plane. In 1, the ligand L1 is uniquely bonded to the Ni atom in an adjacent molecule in a μ2, κ2 S,S-chelating–bridging manner, forming a weak dimer with a Ni…S distance of 2.96 Å, which is shorter than the sum of the van der Waal’s radii of the Ni and S atoms. In 2 the steric restrictions of the bulky dppe ligand hindered any dimerization, but result in the formation of a rare intramolecular C–H…Ni anagostic interaction between the ortho hydrogen atom of the phenyl ring and the nickel centre, which has been assessed by theoretical calculations. The supramolecular structures of 1 and 2 are sustained by π(chelate)…π(bpy), C–H…O, C–H…π(chelate) and C–H…π(Ar) interactions. The two compounds are weakly conducting (σrt = 10−7–10−5 S cm−1), but show semiconducting behavior in the 303–363 K temperature range.

Two new heteroleptic Ni(II) 1,1-dithiolate-bpy/dppe complexes have been synthesized and characterized. X-ray crystallography revealed less common intramolecular C–H⋯Ni interactions in 2. The C–H⋯Ni interactions have been corroborated by theoretical calculations. The pressed pellet electrical conducting behavior of 1–2 has been investigated.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polyhedron - Volume 101, 24 November 2015, Pages 251–256
نویسندگان
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