Di-aqua-bridged dinuclear Cu(II) isonicotinate adducts using 2,2鈥?bipyridine and 1,10-phenanthroline
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- 作者：Krishna Chary Thatipamula ; G. Bhargavi ; M.V. Rajasekharan ; mvrsc@uohyd.ernet.in" class="auth_mail" title="E-mail the corresponding author
- 关键词：Copper(II) ; Bpy ; Phen ; Isonicotinic acid ; Magnetic properties
- 刊名：Polyhedron
- 出版年：2015
- 出版时间：5 September 2015
- 年：2015
- 卷：97
- 期：Complete
- 页码：182-187
- 全文大小：1434 K
文摘
Two new diaquo-bridged dicopper(II) complexes are obtained by reacting Cu(II) nitrate with isonicotinic acid and either 2,2′-bipyridine (bpy) or 1,10-phenanthroline (phen). They are formulated as [Cu2(渭-OH2)2(L)2(INH)2(NO3)2](NO3)2 where L = bpy (1), phen (2) and INH = zwitterion of isonicotinic acid. Both the complexes were characterized by single crystal X-ray diffraction analysis, variable temperature magnetic susceptibility measurements and EPR spectroscopy. The complexes consist a dinuclear cation, [Cu(OH2)2Cu]+4 at its core in which the water molecules function as unsymmetrical bridges between Cu(II) octahedra in the equatorial–axial mode. The variable temperature (3–300 K) magnetic susceptibility measurements suggest weak ferromagnetic coupling in the dicopper(II) cation with 2J = 3.52 and 1.80 cm−1 respectively for 1 and 2. Both compounds give triplet state EPR with similar zero-field splitting parameter, D = 0.034 cm−1 for 1 and 0.038 cm−1 for 2.