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Manganese and iron PCP pincer complexes – the influence of sterics on structure and reactivity
Dalton Transactions ( IF 3.5 ) Pub Date : 2021-09-09 , DOI: 10.1039/d1dt02407h
Wolfgang Eder 1 , Daniel Himmelbauer 1 , Berthold Stöger 2 , Luis F Veiros 3 , Marc Pignitter 4 , Karl Kirchner 1
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The syntheses of various manganese and iron PCP pincer complexes via a solvothermal oxidative addition methodology is described. Upon reacting [Mn2(CO)10] with the ligands (P(C–Br)PCH2-iPr) (1a) and (P(C–Br)PO-iPr) (1b), Mn(I) PCP pincer complexes [Mn(PCPCH2-iPr)(CO)3] (2a) and [Mn(-PCPO-iPr)(CO)3] (2b) were obtained. Protonation of 2a with HBF4·Et2O led to the formation of [Mn(κ3P,CH,P-P(CH)PCH2-iPr)(CO)3]BF4 (3) featuring an η2-Caryl–H agostic bond. The solvothermal reaction of 1a with [Fe2(CO)9] afforded the Fe(II) PCP pincer complex [Fe(PCPCH2-iPr)(CO)2Br] (4). Treatment of 4 with Li[HBEt3] afforded the Fe(I) complex [Fe(PCPCH2-iPr)(CO)2] (5a). When using the sterically more demanding ligands (P(C–Br)PCH2-tBu) (1c) and (P(C–Br)PO-tBu)(1d) striking differences in reactivity were observed. While neither 1c nor 1d showed any reactivity towards [Mn2(CO)10], the reaction with [Fe2(CO)9] and [Fe(CO)5] led to the formation of the Fe(I) complexes [Fe(PCPCH2-tBu)(CO)2] (5b) and [Fe(PCPO-tBu)(CO)2] (5c). X-ray structures of representative complexes are provided.

中文翻译:

锰和铁 PCP 钳形复合物 - 空间对结构和反应性的影响

描述了通过溶剂热氧化加成方法合成各种锰和铁 PCP 钳形配合物。[Mn 2 (CO) 10 ] 与配体 (P(C–Br)P CH 2 -iPr) ( 1a ) 和 (P(C–Br)P O -iPr) ( 1b ) 反应后,Mn( I )得到PCP钳形复合物[Mn(PCP CH 2 -iPr)(CO) 3 ] ( 2a )和[Mn(-PCP O -iPr)(CO) 3 ] ( 2b )。HBF 4 ·Et 2质子化2aO 导致形成 [Mn(κ 3 P , CH , P -P(CH)P CH 2 -iPr)(CO) 3 ]BF 4 ( 3 ),其特征是具有 η 2 -C芳基-H 正键。1a与 [Fe 2 (CO) 9 ]的溶剂热反应得到 Fe( II ) PCP 钳形配合物 [Fe(PCP CH 2 -iPr)(CO) 2 Br] ( 4 )。的治疗4与Li [HBEt 3 ]得到的Fe()络合物的[Fe(PCP CH 2-iPr)(CO) 2 ] ( 5a )。当使用空间上要求更高的配体 (P(C-Br)P CH 2 - t Bu) ( 1c ) 和 (P(C-Br)P O - t Bu)( 1d ) 时,观察到反应性的显着差异。虽然1c1d都没有对 [Mn 2 (CO) 10 ]表现出任何反应性,但与 [Fe 2 (CO) 9 ] 和 [Fe(CO) 5 ] 的反应导致形成 Fe( I ) 配合物 [Fe (PCP CH 2 - t Bu)(CO) 2] ( 5b ) 和 [Fe(PCP O - t Bu)(CO) 2 ] ( 5c )。提供了代表性复合物的 X 射线结构。
更新日期:2021-09-16
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