Sintesi e coordinazione di leganti Ciclopentadienilici O-Multifunzionalizzati

Natanti, Paolo (2008) Sintesi e coordinazione di leganti Ciclopentadienilici O-Multifunzionalizzati, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Scienze chimiche, 20 Ciclo. DOI 10.6092/unibo/amsdottorato/1044.
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The introduction of hydroxyl groups into ligands is able to transfer high hydrophilic features to the related metal systems. The atom-economy synthetic procedure adopted which consists in the one-step Cyclopentene-oxide ring opening, quantitatitatively affords stereoselective formation of the multi-hydroxyl rac-1,2,4- C5H2[CH(CH2)3CHOH]3 Cpººº ligand1. Rh complexation of Cpººº gives rise to a novel class of water-soluble complexes (L,L)RhCpººº (LL=NBD 1, COD 2, CH2CH2 3, CO 4) (Scheme 1) characterized by their spectroscopic features (ESI-MS, IR, 2D NMR, n.O.e.). The X-ray diffraction studies of 1a reveal the occurrence of one couple of enantiomeric pairs in the crystal structure, whilst the crystal packing shows an interesting self-organization in chains of dimeric units of 1a, promoted by strong intermolecular hydroxyl H-bonding. This effect has been exploited by performing VT NMR experiments in different solvents (CDCl3, Py, DMSO). Unpredictably, in the absence of chiral tag, 1 exhibits solvent-dependent chiroptical properties (CD, αD^ 25), which are correlated to UV transitions and DFT calculations. The intra/inter molecular H-binding is crucial in driving the equilibrium between the observed atropisomers 1a and 1b, by varying the planar chirality on the two π-complexes.

Tipologia del documento
Tesi di dottorato
Natanti, Paolo
Dottorato di ricerca
Settore disciplinare
Settore concorsuale
Parole chiave
leganti ciclopentadienilici
Data di discussione
15 Aprile 2008

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