Synthesis and Magnetism of Cu(II)-Ln(III)-Cu(II) (Ln+La, Nd, Gd, Tb, Ho, Er) Trinuclear Complexes Bridged by N, N'-Bis[3-dimethylamino)propyl]oxamido

• Autorzy: Yan C. , Li L. , Li Y. , Zhang G. , Sun W.
• Języki publikacji: EN

Abstrakty

EN

Six new mi-oxamido-bridged copper(II)-lanthanide(III)-copper(II) heterotrinuclear complexes described by the overall formula Cu2(dmoxpn)2Ln(NO3)3 {Ln = La, Nd, Gd, Tb, Ho, Er; dmoxpn = N,N'bis[3-(dimethylamino)propyl]oxamido dianions} have been synthesized and characterized by elemental analyses, molar conductivity measurements, IR and electronic spectral studies. The variable-temperature susceptibility (4.2~300 K), ESR measurements, and studies of the Cu2(dmoxpn)2Gd(NO3)3 complex have revealed that the central gadolinium(III) and terminal copper(II) ions are ferromagnetically coupled with the exchange integral J(Cu-Gd) = +6.85 cm-1, while an antiferromagnetic coupling is detected between the terminal copper(II) ions with J'(Cu-Cu) = -0.27 cm-1, on the basis of the spin Hamiltonian operator [H=-2J(S Cu1.S Gd+S Cu2.Gd)-2J(S Cu1.S Cu2)]. A plausible mechanism for the ferromagnetic coupling between copper(II) and gadolinium( III) is discussed in terms of spin polarization.

Słowa kluczowe

EN

mi-oxamido-bridge; copper(II); lanthanide(III); heterotrinuclear complexes; magnetism

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2005
• Tom: Vol. 79 / nr 9
• Strony: 1425--1433
• Opis fizyczny: Bibliogr. 31 poz. rys.

Twórcy

autor

Yan C.

• College of Marine Life Sciences, Ocean University of China, Qingdao,Shandong, 266003, P. R. China

autor

Li L.

• College of Marine Life Sciences, Ocean University of China, Qingdao,Shandong, 266003, P. R. China

autor

Li Y.

• Marine Drug & Food Institute, Ocean University of China, 5 Yushan Road, Qingdao,Shandong 266003, P. R. China

autor

Zhang G.

• Marine Drug & Food Institute, Ocean University of China, 5 Yushan Road, Qingdao,Shandong 266003, P. R. China

autor

Sun W.

• College of Marine Life Sciences, Ocean University of China, Qingdao,Shandong, 266003, P. R. China

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