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• 作者：Xinmin Wu ; Jinxiu Huang ; Haiyan Li ; Wei Li
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2011
• 出版时间：May 12, 2011
• 年：2011
• 卷：56
• 期：5
• 页码：1991-1994
• 全文大小：718K
• 年卷期：v.56,no.5(May 12, 2011)
• ISSN：1520-5134

文摘

Two crystalline compounds of rare-earth chlorides coordinated with l-proline, [RE(l-Pro)₂(H₂O)₅]Cl₃ (RE = Ho, Er), were synthesized. Their structures were characterized using thermogravimetric analysis (TG), differential thermal analysis (DTA), and chemical analytical methods, the purities of the [RE(l-Pro)₂(H₂O)₅]Cl₃ (RE = Ho, Er) complexes were determined to be 98.85 % and 98.62 %, respectively. After the measurement of the dissolving heat of the two systems, [RE(NO₃)₃路6H₂O + 2l-Pro + 3NaCl] and {[RE(l-Pro)₂(H₂O)₅]Cl₃ + 3NaNO₃}, at 298.15 K in 2 mol路dm^鈭? HCl solvent by using a conduction microcalorimeter, the standard enthalpies of formation of the two crystalline compounds at 298.15 K were determined to be 螖_fH_m{[Ho(l-Pro)₂(H₂O)₅]Cl₃, s, 298.15 K} = (鈭?675.0 卤 1.3) kJ路mol^鈭? and 螖_fH_m{[Er(l-Pro)₂(H₂O)₅]Cl₃, s, 298.15 K} = (鈭?655.9 卤 1.6) kJ路mol^鈭?, respectively.