New organometallic Ru(II) and Fe(II) complexes with tetrathia-[7]-helicene derivative ligands |
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| Authors: | Maria Helena Garcia Pedro Florindo Maria de Fátima M Piedade Stefano Maiorana Emanuela Licandro |
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| Institution: | 1. Centro de Ciências Moleculares e Materiais, Faculdade de Ciências da Universidade de Lisboa, Ed.C8, Campo Grande, 1749-016 Lisboa, Portugal;2. Centro de Química Estrutural, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;3. Dipartimento di Chimica Organica e Industriale, Università degli Studi di Milano, Via C. Golgi, 19, I-20133 Milano, Italy |
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| Abstract: | A series of organometallic complexes possessing new tetrathia-7]-helicene nitrile derivative ligands TH-7] as chromophores, of general formula MCp(P–P)(NC{TH-7]-Y}Z)]PF6] (M = Ru, Fe, P–P = DPPE, Y = H, NO2, Z = H, C≡N; M = Ru, L–L = 2PPh3, Y = H, Z = H) has been synthesized and fully characterized. 1H NMR, FT-IR and UV–Vis. spectroscopic data were analyzed with in order to evaluate the existence of electronic delocalization from the metal centre to the coordinated ligand to have some insight on the potentialities of these new compounds as non-linear optical molecular materials. Slow crystallization of compound RuCp(PPh3)2(NC{TH-7]-H}H)]PF6] 2Ru revealed an interesting isomerization of the helical ligand with formation of two carbon-carbon bonds between the two terminal thiophenes, leading to the total closure of the helix (2*Ru). |
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| Keywords: | Heterohelicenes Tetrathia-[7]-helicene Ruthenium(II) Iron(II) Monocyclopentadienyl |
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