Association of Tris(acetylacetonato)chromium(III) with Chlorinated Phenols in the Liquid–Liquid Partition System
Association of Tris(acetylacetonato)chromium(III) with Chlorinated Phenols in the Liquid–Liquid Partition System
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液-液分配系统中三(乙酰丙酮)铬(III)与氯化酚的缔合
DOI：
10.1246/bcsj.64.2470
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发表时间：
1991
影响因子：
4
通讯作者：
N. Suzuki
中科院分区：
文献类型：
--
作者：
S. Katsuta;H. Imura;N. Suzuki
在298.2 K下，研究了三（乙酰丙酮）铬（III） （[Cr(acac)3]）在庚烷和0.10 mol dm−3高氯酸钠水溶液中在一系列氯化酚（HA）存在下的液液分配行为。[Cr(acac)3]与HA的配分系数显著增强，例如，当有机相中存在0.02 mol dm−3,5-二氯苯酚时，配分系数提高了约1000倍。这种效应归因于[Cr(acac)3]在有机相中与HA的结合。通过配分平衡分析，确定了缔合物为[Cr(acac)3]·iHA (i=1,2)，并确定了缔合常数（βass,i）。在具有相同2,6位取代基组合的HA族中，βass，i值随着HA酸解常数的增加而增加，即这种结合是由于HA的羟基氢原子与[Cr(acac)3]形成氢键。线性自由能关系是…
The liquid–liquid partition behavior of tris(acetylacetonato)chromium(III) ([Cr(acac)3]) between heptane and 0.10 mol dm−3 aqueous sodium perchlorate solutions has been studied in the presence of a series of chlorinated phenols (HA) at 298.2 K. A large enhancement of the partition coefficient of [Cr(acac)3] with HA has been observed, e.g., it rises by about 1000-fold in the presence of 0.02 mol dm−3 3,5-dichlorophenol in the organic phase. This effect is ascribable to the association of [Cr(acac)3] with HA in the organic phase. From a partition-equilibrium analysis, the association complexes have been identified as being [Cr(acac)3]·iHA (i=1,2), and the association constants (βass,i) determined. The βass,i, value increases with an increase of the acid-dissociation constant of HA in the family of HA with the same combination of substituents at the 2,6-positions, i.e., the association is due to hydrogen bonding of the hydroxyl hydrogen atom of HA to [Cr(acac)3]. A linear free-energy relationship has been fo...