NDLI: Dinuclear copper(II) complexes with ferromagnetic and antiferromagnetic interactions mediated by a bridging oxalato group: structures and magnetic properties of [Cu$_{2}$L$_{4}$(μ-C$_{2}$O$_{4}$)](PF$_{6}$)$_{2}$(H$_{2}$O)$_{2}$ and [Cu$_{2}$L$_{2}$(μ-C$_{2}$O$_{4}$)(NO$_{3}$)$_{2}$((CH$_{3}$)$_{2}$NCOH)$

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Dinuclear copper(II) complexes with ferromagnetic and antiferromagnetic interactions mediated by a bridging oxalato group: structures and magnetic properties of [Cu$_{2}$L$_{4}$(μ-C$_{2}$O$_{4}$)](PF$_{6}$)$_{2}$(H$_{2}$O)$_{2}$ and [Cu$_{2}$L$_{2}$(μ-C$_{2}$O$_{4}$)(NO$_{3}$)$_{2}$((CH$_{3}$)$_{2}$NCOH)$_{2}$] (L = di-2-pyridylamine)

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Forthcoming articles ( Transition Metal Chemistry , Volume 29 , Issue 8 )

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Transition Metal Chemistry : Volume 29, Issue 1, February 2004

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Dinuclear copper(II) complexes with ferromagnetic and antiferromagnetic interactions mediated by a bridging oxalato group: structures and magnetic properties of [Cu$_{2}$L$_{4}$(μ-C$_{2}$O$_{4}$)](PF$_{6}$)$_{2}$(H$_{2}$O)$_{2}$ and [Cu$_{2}$L$_{2}$(μ-C$_{2}$O$_{4}$)(NO$_{3}$)$_{2}$((CH$_{3}$)$_{2}$NCOH)$_{2}$] (L = di-2-pyridylamine)

Content Provider	Springer Nature Link
Author	Youngme, Sujittra Gunnasoot, Pimprapun Chaichit, Narongsak Pakawatchai, Chaveng
Copyright Year	2004
Abstract	Two dinuclear Cu$^{II}$ complexes of formula [Cu$_{2}$(dpyam)$_{4}$(μ-C$_{2}$O$_{4}$)](PF$_{6}$)$_{2}$(H$_{2}$O)$_{2}$ (1) and [Cu$_{2}$(dpyam)$_{2}$(μ-C$_{2}$O$_{4}$)(NO$_{3}$)$_{2}$(DMF)$_{2}$] (2) (dpyam=di-2-pyridylamine) have been synthesized and their spectroscopic and magnetic properties characterized. Complex (1) crystallizes in the non-centrosymmetric monoclinic space group Pc, while (2) crystallizes in the non-centrosymmetric triclinic space group P1. Compound (1) involves the compressed octahedral Cu$^{II}$ environment, whereas (2) exhibits an elongated octahedral Cu$^{II}$ geometry. Both complexes contain six-coordinate metal centers bridged by planar bis-didentate oxalate group. The geometry, spectroscopic properties and the effective magnetic moment of (1) are very close to those of the recently published [Cu$_{2}$(dpyam)$_{4}$ (μ-C$_{2}$O$_{4}$)](ClO$_{4}$)$_{2}$(H$_{2}$O)$_{3}$ and [Cu$_{2}$(dpyam)$_{4}$(μ-C$_{2}$O$_{4}$)](BF$_{4}$)$_{2}$(H$_{2}$O)$_{3}$. Thus (1) is expected to exhibit a very weak ferromagnetic interaction between the Cu$^{II}$ centers which is confirmed by EPR spectrum. Those of (2) are comparable to those of the recently published [Cu$_{2}$(dpyam)$_{2}$(μ-C$_{2}$O$_{4}$)(NO$_{3}$)$_{2}$(DMSO)$_{2}$]. Therefore a strong antiferomagnetic interaction is expected. The effective magnetic moment at room temperature of (1) was measured to be 2.55 BM/dimer, which agrees with the spin only value of Cu$^{II}$, 2.45BM calculated for two uncoupled spin=1/2 centers. In (2) the room temperature effective magnetic moment of 2.16 BM/dimer indicates the partial spin paring by antiferromagnetic coupling. This is confirmed by the e.p.r. spectrum and is explained as a result of the magnetic interaction between the coplanar $${\rm d}_{x^2-y^2}$$ orbitals on the two copper atoms.
Starting Page	840
Ending Page	846
Page Count	7
File Format	PDF
ISSN	03404285
Journal	Transition Metal Chemistry
Volume Number	29
Issue Number	8
e-ISSN	1572901X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Inorganic Chemistry Physical Chemistry Catalysis
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Metals and Alloys Inorganic Chemistry

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