Magnetic Properties and Crystal Structure of a One-Dimensional Phase of Tetrakis(2-benzoato-O,O')-bis(
详细信息 查看全文
- 作者：Yasmi Reyes-Ortega ; José ; L. Alcá ; ntara-Flores ; Marí ; a C. Herná ; ndez-Galindo ; Daniel Ramí ; rez-Rosales ; Sylvain Bernè ; s ; Juá ; n C. Ramí ; rez-Garcí ; a
- 刊名：Journal of the American Chemical Society
- 出版年：2005
- 出版时间：November 23, 2005
- 年：2005
- 卷：127
- 期：46
- 页码：16312 - 16317
- 全文大小：223K
- 年卷期：v.127,no.46(November 23, 2005)
- ISSN：1520-5126
文摘
A new crystalline polymorphic phase of tetrakis(
2-benzoato-O,O')-bis(dimethyl sulfoxide)dicopper(II) was obtained by direct synthesis, in space group P21/n. The copper coordination is in a slightly distortedsquare pyramidal geometry with an intramolecular Cu···Cu distance of 2.6494(8) Å. The Cu-O distancesof the two copper in a dimer are different, giving different chemical environments for each Cu ion. Thecrystal structure is built up of well-separated stacking columns oriented along the b-axis, with units uniformlyspaced, producing a one-dimensional (1-D) zigzag chain through Cu(II)-S···S-Cu(II) interdimer interactions[S···S separation: 3.975(2) Å]. Magnetization measurements in the range 2-300 K indicate two magneticorderings, at low temperature (T < 10 K) a weak ferromagnetic ordering is observed, and above thistemperature an antiferromagnetic behavior takes place. ESR spectra at 300 and 77 K of a polycrystallinesample show the characteristic signal of zero-field with D = 0.354 cm-1, consistent with a ferromagneticCu···Cu exchange interaction at low temperature.
2-benzoato-O,O')-bis(dimethyl sulfoxide)dicopper(II) was obtained by direct synthesis, in space group P21/n. The copper coordination is in a slightly distortedsquare pyramidal geometry with an intramolecular Cu···Cu distance of 2.6494(8) Å. The Cu-O distancesof the two copper in a dimer are different, giving different chemical environments for each Cu ion. Thecrystal structure is built up of well-separated stacking columns oriented along the b-axis, with units uniformlyspaced, producing a one-dimensional (1-D) zigzag chain through Cu(II)-S···S-Cu(II) interdimer interactions[S···S separation: 3.975(2) Å]. Magnetization measurements in the range 2-300 K indicate two magneticorderings, at low temperature (T < 10 K) a weak ferromagnetic ordering is observed, and above thistemperature an antiferromagnetic behavior takes place. ESR spectra at 300 and 77 K of a polycrystallinesample show the characteristic signal of zero-field with D = 0.354 cm-1, consistent with a ferromagneticCu···Cu exchange interaction at low temperature.