双环辛四烯合钍是由钍和两个环辛四烯阴离子（COT2-）组成的金属有机化合物，化学式为Th(C8H8)2，可简写为Th(COT)2。它可由四氯化钍和环辛四烯二钾在四氢呋喃中反应制得：[2]
- ThCl4 + C8H8K2 → (C8H8)2Th + 4 KCl
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单晶衍射表明，它属单斜晶系，空间群P21/n，其分子具有D8h对称性。[1]
双环辛四烯合钍和四氯化钍在四氢呋喃（THF）中反应，从溶液中可以结晶出白色的Th(COT)Cl2(THF)2。[3]它和四乙基氰化铵在吡啶中回流反应，从溶液中可以结晶出金黄色的[(COT)2Th(CN)][N(C2H5)4]。[4]
Avdeef, Alex; Raymond, Kenneth N.; Hodgson, Keith O.; Zalkin, Allan. Two isostructural actinide .pi. complexes. Crystal and molecular structure of bis(cyclooctatetraenyl)uranium(IV), U(C8H8)2, and bis(cyclooctatetraenyl)thorium(IV), Th(C8H8)2. Inorganic Chemistry (American Chemical Society (ACS)). 1972, 11 (5): 1083–1088. ISSN 0020-1669. doi:10.1021/ic50111a034. Goffart, J.; Fuger, J.; Gilbert, B.; Kanellakopulos, B.; Duyckaerts, G. On the cyclooctateraenyl complexes of actinide elements Part I : Thorium. Inorganic and Nuclear Chemistry Letters (Elsevier BV). 1972, 8 (4): 403–412. ISSN 0020-1650. doi:10.1016/0020-1650(72)80021-7. Zalkin, Allan; Templeton, David H.; Le Vanda, Carole; Streitwieser, Andrew. Synthesis and structure of two crystalline forms of (cyclooctatetraene)thorium(IV) dichloride-bis(tetrahydrofuran). Inorganic Chemistry (American Chemical Society (ACS)). 1980, 19 (9): 2560–2563. ISSN 0020-1669. doi:10.1021/ic50211a015. Hervé, Alexandre; Thuéry, Pierre; Ephritikhine, Michel; Berthet, Jean-Claude. Structural Diversity in Cyanido Thorocene Complexes. Organometallics (American Chemical Society (ACS)). 2014-04-16, 33 (8): 2088–2098. ISSN 0276-7333. doi:10.1021/om500252v.
