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Transformations of Cobalt(II) Trifluoroacetates in 1,4-Dioxane: Solvent Effect on the Composition, Structure, and Crystal Packing of the Molecules
Russian Journal of Coordination Chemistry ( IF 1.1 ) Pub Date : 2020-09-09 , DOI: 10.1134/s1070328420090079
M. A. Uvarova , S. E. Nefedov

Abstract

The reaction of aqueous cobalt(II) acetate with trifluoroacetic acid in methanol affords complex [Co(OOCF3)2(OH2)4] (I). The same reaction in a methanol–benzene–dioxane mixture of solvents gives mononuclear complex [Co(OOCF3)2(OH2)6] ∙ O(CH2CH2)2O (II) in which the solvate dioxane molecule forms a single crystal by the formation of hydrogen bonds with coordinated water molecules. A similar reaction in pure dioxane affords trinuclear complex {Co3(OOСCF3)4(OH2)2(OOСCF3)2[O(CH2CH2)2O]2} ∙ 2HOOСCF3 ∙ 2O(CH2CH2)2O (III) containing both solvate and coordinated dioxane molecules. The crystallization of complex III from an isopropanol–dioxane mixture leads to complex [Co(OOСCF3)2(OH2)4] ∙ 2O(CH2CH2)2O (IV). The reaction of complex III with pyrazole (HРz) affords mononuclear complex [Co(OOСCF3)2(HРz)4] ∙ 2O(CH2CH2)2O (V). The reaction of complex I with HРz in methylene dichloride leads to mononuclear complex [Co(OOСCF3)2(HРz)4] (VI). The structures of coordination compounds IVI are determined by X-ray diffraction analysis (СIF files CCDC nos. 1985667 (I), 1985666 (II), 1985671 (III), 1985670 (IV), 1985665 (V), and 1985669 (VI) at Т = 296(2) K and 1985668 (VI) at Т = 150(2) K).



中文翻译:

1,4-二恶烷中三氟乙酸钴(II)的转化:溶剂对分子组成,结构和晶体堆积的影响

摘要

乙酸钴(II)水溶液与三氟乙酸在甲醇中的反应得到配合物[Co(OOCF 32(OH 24 ](I)。在甲醇-苯-二恶烷混合溶剂中进行相同的反应,得到单核络合物[Co(OOCF 32(OH 26 ]∙O(CH 2 CH 22 O(II),其中溶剂化物二恶烷分子形成单晶通过与配位的水分子形成氢键而形成。在二恶烷纯,得到类似的反应三核配合{有限公司3(OOСCF 34(OH 22(OOСCF 32 [O(CH 2 CH 22 O] 2 }∙2HOOСCF 3 ∙2 O(CH 2 CH 22 O(III含有的溶剂化物和二恶烷协调分子)。复合物的结晶III从异丙醇-二恶烷混合物导致复杂的[CO(OOСCF 32(OH 24 ]∙2 O(CH 2 CH 22 O(IV)。络合物的反应III与吡唑(HРz),得到单核配合物[CO(OOСCF 32(HРz)4 ]∙2 O(CH 2 CH 22 O(V)。配合物I与H?z在二氯甲烷中的反应生成单核配合物[Co(OO?CF 32(H?z)4 ](VI)。配位化合物IVI的结构通过X射线衍射分析确定(СIF文件,CCDC号1985667(I),1985666(II),1985671(III),1985670(IV),1985665(V)和1985669(VI)在Т = 296(2)K时和1985668(VI)在Т = 150(2)K时)。

更新日期:2020-09-10
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