Komplexierung von 1,3‐Dihydro‐1, 3, 10, 10‐tetramethyl‐1, 3‐dibora‐4, 5‐benzopentafulven mit Fe(CO)3‐ und CpCo‐Fragmenten: Synthese, Kristall‐ und Elektronenstruktur von Tricarbonyl[η5‐cyclopentadienyl)cobalt] [μ,η5:η4‐(1, 3‐dihydro‐1, 3, 10, 10‐tetramethyl‐1, 3‐dibora‐4, 5‐benzopentafulven)]eisen

Abstract

Complexation of 1, 3‐Dihydro‐1, 3, 10, 10‐tetramethyl‐1, 3‐dibora‐4, 5‐benzopentafulvene with Fe(CO)3 and CpCo Fragments: Synthesis, Crystal and Electronic Structure of Tricarbonyl[(η5‐cyclopentadienyl)cobalt][μ,η5:η4‐(1, 3‐dihydro‐1, 3, 10, 10‐tetramethyl‐1, 3‐dibora‐4, 5‐benzopentafulvene)]ironReaction of the 1, 3‐dibora‐4, 5‐benzopentafulvene 1 with the isolobal organometallic fragments Co(C5H5) and Fe(CO)3 leads to the slipped triple‐decker complex 5. It is also formed when 2 is stacked with the Co(C5H5) fragment. The X‐ray structure analysis of 5 reveals that the Co(C5H5) fragment is coordinated to the 1, 3‐diborole ring, and the Fe(CO)3 group interacts with the Y‐shaped B2CC unit. An MO calculation indicates that the formation of 5 occurs by distortion of 2 (η5‐ → η4‐bonding) and complexation of the Co(C5H5) group. 5 is 16 kcal/mol more stable than its structural isomer 6.