Ferromagnetism in an Extended Three-Dimensional, Diamond-like Copper(II) Network: A New Copper(II)/1-Hydroxybenzotriazolato Complex Exhibiting Soft-Magnet Properties and Two Transitions at 6.4 and 4.4
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- 作者：Vassilis Tangoulis ; Catherine P. Raptopoulou ; Vassilis Psycharis ; Aris Terzis ; Konstantina Skorda ; Spyros P. Perlepes ; Olivier Cador ; Olivier Kahn ; and Evangelos G. Bakalbassis
- 刊名：Inorganic Chemistry
- 出版年：2000
- 出版时间：June 12, 2000
- 年：2000
- 卷：39
- 期：12
- 页码：2522 - 2529
- 全文大小：167K
- 年卷期：v.39,no.12(June 12, 2000)
- ISSN：1520-510X
文摘
The use of the substituted benzotriazole ligand btaOH (1-hydroxybenzotriazole) in copper(II) chemistry has yieldeda structurally and magnetically very interesting complex. The [Cu2(O2CMe)4(H2O)2]/btaOH·H2O/aqueous NH3(1:4:4, 1:3:3, 1:2:2) reaction system in MeOH gives dark brown-green [Cu(btaO)2(MeOH)]n (4) in ~80% yield.4 crystallizes in the tetragonal space group P43212 with (at 25 
C) a = 9.915(1) Å, b = 9.915(1) Å, c = 14.715(2) Å, and Z = 4. The structure consists of a 3D, diamond-like copper(II) lattice. The CuII atom has a squarepyramidal geometry with four btaO- ligands at the basal plane. The btaO- ion functions as a bidentate bridgingligand, with N(3) and the deprotonated oxygen being the ligating atoms. Dc and ac magnetic susceptibilitymeasurements, together with low-field (10 G) and high-field (up to 5000 G) magnetization data, are consistentwith ferromagnetic interactions on the scale of the crystal lattice with two critical temperatures: 6.4 and 4.4 K.The former critical temperature could correspond to a transition from a paramagnetic to a ferromagnetic state; thelatter one, to a transition from a ferromagnetically ordered state to its 3D ordering. The magnetic data, along withthe field dependence of the magnetization and the EPR data, are also in line with a soft magnet. Moreover, theEPR studies performed on 4 reveal unique features reported for the first time in the field of molecular magnetism.
C) a = 9.915(1) Å, b = 9.915(1) Å, c = 14.715(2) Å, and Z = 4. The structure consists of a 3D, diamond-like copper(II) lattice. The CuII atom has a squarepyramidal geometry with four btaO- ligands at the basal plane. The btaO- ion functions as a bidentate bridgingligand, with N(3) and the deprotonated oxygen being the ligating atoms. Dc and ac magnetic susceptibilitymeasurements, together with low-field (10 G) and high-field (up to 5000 G) magnetization data, are consistentwith ferromagnetic interactions on the scale of the crystal lattice with two critical temperatures: 6.4 and 4.4 K.The former critical temperature could correspond to a transition from a paramagnetic to a ferromagnetic state; thelatter one, to a transition from a ferromagnetically ordered state to its 3D ordering. The magnetic data, along withthe field dependence of the magnetization and the EPR data, are also in line with a soft magnet. Moreover, theEPR studies performed on 4 reveal unique features reported for the first time in the field of molecular magnetism.