title: Tuning the Excimer Emission of Amphiphilic Platinum(II) Complexes Mediated by Phospholipid Vesicles.
abstract: Two new amphiphilic platinum(II) complexes, [Pt(2-(4-fluorophenyl)-5-(4-dodecyloxyphenyl)pyridine) (acac)] (Pt-1) and [Pt(2-(4-dodecyloxyphenyl)-5-(thien-2-yl)-c-cyclopentenepyridine) (acac)] (Pt-2), where acac is acetylacetonate, were synthesized and characterized. Apart from conventional phosphorescence of single molecules (ME-monomer emission), complexes Pt-1 and Pt-2 also exhibit excimer emission (EE) when embedded into phospholipid vesicles, that is assigned to emissive Pt-Pt excimers. The EE intensity in vesicular media appeared to depend on the viscosity of the vesicles and the concentration of the embedded complex. Differences in the EE properties of complexes Pt-1 and Pt-2 are correlated with the energies of the π-character frontier orbitals defined by the design of the cyclometalating phenylpyridine ligand. Higher energies of the frontier π-orbitals (HOMO and LUMO) naturally promote stronger π-π interactions, thus obstructing the PtII-PtIIinteraction.
authors.affiliation: Ural Federal University , Mira 19, Ekaterinburg, 620002, Russia.|I. Postovsky Institute of Organic Synthesis , Ekaterinburg, 620990, Russia.
authors.forename: Marsel Z
authors.identifier: http://orcid.org/0000-0003-0495-0364
authors.initials: MZ
authors.lastname: Shafikov
authors.affiliation: I. Postovsky Institute of Organic Synthesis , Ekaterinburg, 620990, Russia.
authors.forename: Alfiya F
authors.initials: AF
authors.lastname: Suleymanova
authors.affiliation: I. Postovsky Institute of Organic Synthesis , Ekaterinburg, 620990, Russia.
authors.forename: Dmitry N
authors.initials: DN
authors.lastname: Kozhevnikov
authors.affiliation: Institut für Organische Chemie, Universität Regensburg , Universitätsstraße 31, D-93053 Regensburg, Germany.
authors.forename: Burkhard
authors.initials: B
authors.lastname: König