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Discrete oligomers with a very long π-conjugated path are of major interests for both fundamental and applicative reasons, as they can be used in countless areas ranging from energy and imaging to sensing and advanced optoelectronics. Numerous attempts have been made to achieve a full control of the p-electronic length (1D). In contrast to random and self-organization preparations, the stepwise synthesis of oligomers appears to be the unique efficient method allowing a full control over the chain length. Controlling the width is even more challenging but highly alluring because such two dimensional (2D) variants can be seen as graphene nanoribbons (GNRs), that have been the subject of manifold works during the last decade. If 1D and 2D oligomers could be prepared by classical approaches based on the use of standard C-C coupling reactions to form extensively fused π-conjugated (hetero)aromatic compounds, these approaches clearly suffer from drawbacks in line with the C-C bond formation (purification, side reactions, cost). Developing a new stepwise strategy to access such oligomers with full delocalization of the electrons is therefore extremely appealing. CONDOR wishes to address this fundamental chemical issue by exploiting the long-known but overlooked π-d conjugation phenomenon (delocalization of electrons over both the metal and the ligand). This strategy will allow the first easy and low-cost entry to conjugated oligomers with a perfect dimensional control [both length (1D) and width (2D)], that should give rise to (new) controlled electronic features. This control of the extension of the electrons delocalization is objectively an appealing approach to tune the HOMO-LUMO gap (HLG) and to redshift the absorption bands up to the near infra-red (NIR) region, a remarkable window for many technological sectors.
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