Supramolecular photochemistry of new ruthenium(II) oligopyridine complexes: from design to light conversion

Photochemistry is a natural phenomenon, which began at the origin of the universe and the
world and also a modern science which describes the interaction between light and matter in
several main science domains, such as chemistry, physics and biology. Photochemistry plays
a fundamental role in life (photosynthesis, vision, phototaxis, etc…) and also in technology
(image reproduction, photocatalysis, photodegradation, etc…). The last 30 years of
photochemistry have shown the fundamental role played in experiment and theoretical
investigations. From determination of molecular mechanisms to photocatalysis and electronic
information of complex devices, studying photochemistry is now indispensable. The
photochemical and photophysical processes of thousands of organic and organometallic,
coordination compounds complexes have been studied and elucidated, and now confirmed
with the help of theoretical tools to explain the structural, energetic and dynamic properties
of the molecules in their most important excited state. The major part of photochemical
investigations were focused on molecular species with simple processes (molecular
photochemistry).
The combination of atoms leads to molecules and the combination of molecular components
leads to supramolecular species. Current chemical research shows us that photons and energy
information can be used in supramolecular species. The interest in the chemistry of the
interaction of supramolecular species with light is great because its allows several types of
properties not previously observed. In the last few year supramolecular photochemistry has
taken an important part in chemistry. Photochemistry and supramolecular photochemistry are
interdisciplinary areas.
In this introduction we will show the meaning of supramolecular chemistry and also define
some fundamental concepts of photochemistry, and the host-guest theory and explain some
recent investigations oligopyridine chemistry .
This work shows the design of new ruthenium (II) oligopyridine complexes and their
photophysical and electrochemical properties.
Chapter I highlights some recent developments of those topics in chemistry and especially in
supramolecular systems.
Chapter II describes the synthesis via Suzuki-coupling of the in the 4-methoxyphenyl, 3,5-
dimethoxy and 1-naphthyl substitution of 4,4´ position of 2,2´-bipyridine. The corresponding
Ru(II) complexes have been prepared.
Chapter III deals with the synthesis of new starshaped X and Y metallodendrimers , the
synthesis of 4’-substitued tpy ligands their complexation with Ru(II), and the synthesis of
polynuclear supramolecular assemblies.
Chapter IV concerns the photophysical and electrochemical properties of some chapter II and
III complexes Ru(II), determination of luminescence lifetimes and quantum yields.
Chapter V decribes the synthesis of 6,6´-dimethyl-4,4´-(3,5-dimethoxyphenyl)-2,2´-bipyridine
ligand, its complexation with Cu(I) and Ru(II) and their photophysical and electrochemical
properties.
Chapter VI shows the synthesis of 1-pyrenyl substituted tpy ligand and its complexation with
Ru(II), Os(II) and Ir(III) as potent donors and acceptors for the formation of polyads.
Chapter VII concerns the synthesis of narrow band gap spacer with non-classical p electron
ring spacer. The synthesis of 4,7-trimethylsilylacetylenyl-3,1,2-benzothiadiazole and 6,13
derivate of pentacene as potent new spacers for polymetallic rod-like systems.