کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1338801 | 979681 | 2010 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Syntheses, crystal structures and electron paramagnetic resonance studies of CoII- and MnII-coordination polymers with the twisted ligand di(4-pyridyl)disulfide in double bridge fashion
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی معدنی
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چکیده انگلیسی
Four coordination polymers, {[Co2(4-DPSS)4(DMF)4](ClO4)4}n (1), {[Mn2(4-DPSS)4(DMF)4](ClO4)4}n (2), {[Co(4-DPSS)2(H2O)(NO3)]NO3·3H2O}n (3) and [Co(4-DPSS)2(NCS)2]n (4) were synthesized by reaction between the cobalt (II) and manganese (II) salts (perchlorate, thiocyanate and nitrate) and the flexible ligand di(4-pyridyl)disulfide (4-DPSS). All the compounds presented repeated rhomboidal structures in which the di(4-pyridyl)disulfide ligands coordinate the metal centers in a double bridged fashion. The crystal packing of these coordination polymers reveals that, in all cases, weak interactions such as classical and non-classical hydrogen bonds, as well as Sâ¯S interactions, connect the polymeric chains to increase the dimensionality of the network. Low-temperature electron paramagnetic resonance (EPR) measurements on powdered samples show that the transition-metal ions, Co (II) and Mn (II) ions, are in the high spin states S = 3/2 and 5/2, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polyhedron - Volume 29, Issue 13, 3 September 2010, Pages 2657-2666
Journal: Polyhedron - Volume 29, Issue 13, 3 September 2010, Pages 2657-2666
نویسندگان
Maria Vanda Marinho, Lorenzo do Canto Visentin, Márcia Cristina de Souza, Renata Diniz, Klaus Krambrock, Maria Irene Yoshida, Flávia C. Machado,