کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1340071 | 1500294 | 2007 | 5 صفحه PDF | دانلود رایگان |
The hybrid organo-inorganic compounds [Cu4(bipy)4V4O11(PO4)2]nH2O (n ∼ 5) (1), [Cu2(phen)2(PO4)(H2PO4)2(VO2) · 2H2O] (2) and [Cu2(phen)2(O3PCH2PO3)(V2O5) (H2O)]H2O (3) which present different bridging forms of the phosphate/phosphonate group, show different bulk magnetic properties. We herein analyze the magnetic behaviour of these compounds in terms of their structural parameters. We also report a theoretical study for compound (1) assuming four different magnetic exchange pathways between the copper centres present in the tetranuclear unit. For compound (1) the following J values were obtained J1 = +3.29; J2 = −0.63; J3 = −2.23; J4 = −46.14 cm−1. Compound (2) presents a Curie–Weiss behaviour in the whole range of temperature (3–300 K), and compound (3) shows a maximum for the magnetic susceptibility at 64 K, typical for antiferromagnetic interactions. These data where fitted using a model previously reported in the literature, assuming two different magnetic exchange pathways between the four copper(II) centres, with J1 = −30.0 and J2 = −8.5 cm−1.
The hybrid organo-inorganic compounds [Cu4(bipy)4V4O11(PO4)2]nH2O(n ∼ 5) (1), [Cu2(phen)2(PO4)(H2PO4)2(VO2) · 2H2O] (2) and [Cu2(phen)2(O3PCH2PO3)(V2O5)(H2O)]H2O (3) which present different bridging forms of the phosphate/phosphonate group, show different bulk magnetic properties. We also report a theoretical study for compound (1) assuming four different magnetic exchange pathways between the copper centres present in the tetranuclear unit.Figure optionsDownload as PowerPoint slide
Journal: Polyhedron - Volume 26, Issues 9–11, 15 June 2007, Pages 2121–2125