Emanuela Grigiotti

Supramolecular metal-polypyridyl and Ru(II) porphyrin complexes: photophysical, electron paramagnetic resonance, and electrochemical studies.

A series of mixed-metal supramolecular porphyrin arrays in which the geometry of the central metal-polypyridyl moiety defines the spatial arrangement of two or more Ru(II)-porphyrin units through axial coordination have been prepared by employing self-assembly based protocols, and their photophysical and electrochemical properties have been studied. The electrochemical properties of the constituent parts of these arrays depend only on their own chemical environment, regardless of the nuclearity and the overall charge of the compound; in this way species with predetermined redox patterns can be obtained via the synthetic control of the self-assembly process. Interestingly, several of these arrays are luminescent both at room and at low temperatures, and in many cases core-to-periphery or periphery-to-core intramolecular energy transfer processes take place according to the nature of the central metal template.

Heterobimetallorganische 1,2‐(N,N‐Dimethylaminomethyl)ferrocenyl‐Derivate des vier‐ und zweiwertigen Zinns: Synthesen, Charakteristika und Kristallstrukturen

SnCl4 reacts with [1,2-(N,N-dimethylaminomethyl) ferrocenyl]lithium (FcNLi) under formation of the organo tin compounds of the four valued tin (FcN)n SnCl 4-n [n = 1(1), 2(2), 3(3), 4(4)]. The heterobimetallic chelate complex bis[1,2-(N,N-dimethylaminomethyl)ferrocenyl]tin(II) (FcN)2 Sn (5) is formed at the reaction of SnCl2 with two equivalents of FcNLi. The heterobimetallic tin compounds 1 — 5 were characterized by 1H NMR-, 13C-NMR and mass spectroscopy, single crystal x-ray analyses (1,3,4,5), 57 Fe-Moessbauer spectroscopy (1, 3, 4, 5), respectively cyclic voltammetry.