Crystal growth and characterization of Haldane chain compound Ni(C3H10N2)2NO2ClO4

✍ Scribed by W. Tao; L.M. Chen; X.M. Wang; C. Fan; W.P. Ke; X.G. Liu; Z.Y. Zhao; Q.J. Li; X.F. Sun

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 851 KB
• Volume: 327
• Category: Article
• ISSN: 0022-0248
• DOI: 10.1016/j.jcrysgro.2011.05.013

✦ Synopsis

The bulk single crystals of S ¼ 1 chain compound Ni(C 3 H 10 N 2 ) 2 NO 2 ClO 4 are grown by using a slow evaporation method at a constant temperature and a slow cooling method. It is found that the optimum condition of growing large crystals is via slow evaporation at 25 1C using 0.015 mol NiðClO 4 Þ 2 Á 6H 2 O, 0.015 mol NaNO 2 , and 0.03 mol 1,3-propanediamine liquid dissolved into 30 ml aqueous solvent. Highquality crystals with size up to 18 Â 7:5 Â 5 mm 3 are obtained. The single crystals are characterized by measurements of X-ray diffraction, magnetic susceptibility, specific heat and thermal conductivity. The susceptibilities along three crystallographic axes are found to exhibit broad peaks at $ 55 K, and then decrease abruptly to zero at lower temperatures, which is a characteristic of a Haldane chain system. The specific heat and the thermal conductivity along the c-axis can be attributed to the simple phononic contribution and are analyzed using the Debye approximation.