Electronic structure and near-IR transitions of FcC2R and FcC4R dyads
摘要:
This paper describes the orbital configuration which provides a basis for the understanding of the electronic structure and spectroscopic properties of 17e and 18e FcC(2)R and FcC(4)R dyads, where R is H, 1-naphthyl, 9-anthryl, 3-pyrenyl, perylenyl. DFT calculations show that destabilisation of the ferrocenyl pi orbitals upon binding a C equivalent to CR group to a Cp ring leads to the metal-based a, orbital dropping below the e(1)-a so that the frontier orbital configuration is (e(2)'-a, pi)(2) (e(2)'-b, metal)(2) (e(1)'-a, pi)(2), (a(1), metal)(2). The contribution of the aryl group to the pi e(2)-a and e(1)-a orbitals varies with the annelation of the ring. The LUMO is aryl based. The calculations are consistent with the spectroscopic data for the 18e species. Oxidation to the 17e cations does not change the orbital configuration but the orbital energies are lowered by the positive charge centred on the Fe. A strongly solvatochromic transition in the near-IR, a signature for the 17e cations, is best described as an LMCT transition but the contribution Of C2R and C4R to the donor and acceptor levels depends on the ionization energy of the aryl pi orbital. LMCT energies decrease from FcC(2)R to FcC(4)R dyads. (c) 2006 Elsevier Ltd. All rights reserved.
DOI:
10.1016/j.poly.2006.07.002
作为产物:
描述:
二茂铁乙炔 、 9-溴蒽 在
bis-triphenylphosphine-palladium(II) chloride CuI 作用下,
以
further solvent(s) 为溶剂,
以46%的产率得到(9-anthryl)ethynylferrocene