Synthesis, Characterisation of (Arene)tricarbonylchromium Complexes Linked to Cationic Fe and Ru Derivatives and Studies of First Hyperpolarisabilities by Hyper‐Rayleigh Scattering

Abstract

. The Fe or Ru organometallic π-donor fragments were linked by an extended π system to the acceptor Cr(CO) 3 fragment. The effect of π back-donation involving the second Fe or Ru metal centre and the π* orbitals of the NϵC-coordinated group, was probed by the ν (NϵC) stretching bands on the IR spectra and also by NMR spectroscopic data. The planarity, largely due

Synthesis of organometallic Ru(II) and Fe(II) complexes containing fused rings hemi-helical ligands as chromophores. Evaluation of non-linear optical properties by HRS

“…Although some reports concerning the NLO properties of thiophene-based organometallic complexes have been published, they are mainly about ferrocenyl and tricarbonyl chromium arene derivatives [20][21][22][23][24][25][26] in which the metal is unfavourably placed outside of the conjugation plane [27], in contrast with the present complexes and our previously reported oligothiophene containing complexes [15].…”

Compromise between conjugation length and charge-transfer in nonlinear optical η5-monocyclopentadienyliron(II) complexes with substituted oligo-thiophene nitrile ligands: Synthesis, electrochemical studies and first hyperpolarizabilities

“…Therefore, we now study the conjugation-length dependence of the first hyperpolarizability in a series of iron cyclopentadienyl compounds incorporating thiophene derived ligands. Although some reports concerning the NLO properties of thiophene-based organometallic complexes have been published, they are mainly about ferrocenyl and tricarbonyl chromium arene derivatives [19][20][21][22][23][24][25] in which the metal is unfavourably placed outside of the conjugation plane [7], in contrast to the present complexes.…”

Synthesis and structural characterization of ruthenium(II) and iron(II) complexes containing 1,2-di-(2-thienyl)-ethene derived ligands as chromophores

“…Thiophene moiety has been studied as chromophore both in organic [16][17][18] and organometallic [19][20][21][22][23][24][25] materials for NLO and it is nowadays recognized to exhibit enhanced second-order polarizabilities compared to p-systems with phenylene bridges, mainly due to its lower delocalization energy, leading to a more effective conjugation. We recently reported the synthesis and NLO properties of g 5 -monocyclopentadienyliron(II) complexes with substituted oligo-thiophene nitrile derived ligands [26].…”