Answer to Question #164666 in Organic Chemistry for Mary

Question

The complex [(FeCp (CO) 2] 2 (Fp2), displays IR carbonyl absorption bands at 1760 and 2000 cm – 1. (A) What is its molecular structure? (B) Fp2 in solution is in equilibrium with a its isomeric structure, which is slightly higher energy What is this structure? (c) How are molecules that have isomeric structures, such as those in question (b) of Fp2, characterized by rapidly reaching equilibrium? What is the consequence? (d) Photolysis of Fp2 leads to the loss of a CO ligand and the new complex obtained exhibits only one IR carbonyl absorption band at 1760 cm – 1. What is the molecular structure of this new complex? e) Heating Fp2 to 180 ° C leads to a quaternary complex that has lost 2 CO per Fp2 complex and exhibits a strong IR absorption band at 1620 cm – 1. What is the structure of the new complex and the number of valence electrons of each the four Fe atoms?

Answer 1

Cyclopentadienyliron dicarbonyl iodide is an organoiron compound with the formula Fe(CO)₂I. It is a dark brown solid that is soluble in common organic solvents. Fe(CO)₂I, or FpI as it is often known, is an intermediate for the preparation of other organoiron compounds such as in ferraboranes.