SPECTROSCOPIC STUDY OF POLYMERIC NATURE OF BIS(ACETYLACETONATO)COBALT)2)
SPECTROSCOPIC STUDY OF POLYMERIC NATURE OF BIS(ACETYLACETONATO)COBALT)2)
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DOI：
10.1021/ic50011a001
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发表时间：
1964-01-01
影响因子：
4.6
通讯作者：
SODERBERG, RH
中科院分区：
文献类型：
--
作者：
COTTON, FA;SODERBERG, RH
非配位溶剂中二（乙酰丙酮）钴（II）的分子量测量和光谱研究表明存在二聚体、三聚体和一些更高的低聚物。将高稀释条件下CoA2的光谱与一致的单体和四面体双（二戊基甲基）钴（II）， Co (DPM) 2的光谱进行比较，得出CoA2单体也是四面体的结论。将最浓的C0A2溶液的光谱与玻璃态CoA2、结晶态CoA2、CoA2·2h2o（或C0A2·2CH OH）的光谱进行比较，并考虑其他因素，提出低聚物是由CoA2单元组成的，其中钴原子位于氧原子的近似方形阵列中，它们通过进一步共享氧原子而结合。提出了Co (DPM) 2的四面体构型为5-20kcal的一些论点。/mol比平面的更稳定。
Molecular weight measurements and spectroscopic studies of bis (acetylacetonato) cobalt (II) in noncoordinatingsolvents demonstrate the presence of dimers, trimers, and some still higher oligomers. Comparison of the spectra of C0A2 at high dilution with the spectrum of the consistently monomeric and tetrahedral bis (dipivaloylmethanido) cobalt (II), Co (DPM) 2, leads to the conclusion that the CoA2 monomer is also tetrahedral. Comparison of the spectra of the most concentrated solutions of C0A2 with the spectra ofglassy CoA2, crystalline CoA2, and CoA2· 2H20 (or C0A2· 2CH OH) and other con-siderations leadsto the proposal that the oligomers are built up of CoA2 units, in which the cobalt atoms are in approximately square arrays of oxygen atoms, which combineby further sharing of oxygen atoms. Some arguments are presented to suggest that the tetrahedral configuration of Co (DPM) 2 is 5-20kcal./mole more stable than the planar one.