Solubility of β-Diketonate Complexes of Copper(II) and Cobalt(II) in Supercritical Carbon Dioxide
Solubility of β-Diketonate Complexes of Copper(II) and Cobalt(II) in Supercritical Carbon Dioxide
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DOI：
10.1021/je101255v
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发表时间：
2011-03
影响因子：
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通讯作者：
Masashi Haruki;Fumiya Kobayashi;S. Kihara;Shigeki Takishima
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文献类型：
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作者：
Masashi Haruki;Fumiya Kobayashi;S. Kihara;Shigeki Takishima
利用循环式紫外-可见光谱法测定了二价β-二酮酸金属配合物、铜（II）和钴（II）乙酰丙酮酸酯(Cu（acac)2和Co(acac)2）和2,2,6,6-四甲基-3,5-七烷二酸酯(Cu（thd)2和Co(thd)2）在超临界二氧化碳（scCO2）中的溶解度，温度范围为（313 ~ 343）K，以积累有关导电和磁性材料前驱体的新溶解度数据。在20 MPa左右的温度下，Cu(thd)2的溶解度是Cu(acac)2的50 ~ 65倍。在313 K时，Co(acac)2的溶解度大于Co(acac)3。另一方面，Co(thd)2的溶解度在低CO2密度区高于Co(thd)3，在高CO2密度区低于Co(thd)3。此外，钴配合物对金属（acac）2和金属（thd）2的溶解度均高于铜配合物。
The solubilities of the divalent β-diketonate metal complexes, copper(II) and cobalt(II) acetylacetonates (Cu(acac)2 and Co(acac)2), and 2,2,6,6-tetramethyl-3,5-heptanedionates (Cu(thd)2 and Co(thd)2) in supercritical carbon dioxide (scCO2) were measured using a circulation-type apparatus with in situ UV−vis spectrometry at temperatures ranging from (313 to 343) K to accumulate new solubility data on the precursors of conducting and magnetic materials. The solubilities of Cu(thd)2 were about 50- to 65-fold higher than those of Cu(acac)2 at approximately 20 MPa for each temperature level. As for the cobalt complexes, the solubilities of Co(acac)2 were greater than those of Co(acac)3 at 313 K. On the other hand, the solubilities of Co(thd)2 were higher than those of Co(thd)3 in the low CO2 density region and lower than those of Co(thd)3 in the high CO2 density region. Moreover, the solubilities of the cobalt complexes were higher than those of the copper complexes for both the metal(acac)2 and metal(thd)2.