Molecular complexes and main-chain organometallic polymers based on Janus bis(carbenes) fused to metalloporphyrins

Jean-François Longevial (1) , Mamadou Lo (1) , Aurélien Lebrun (2) , Danielle Laurencin (1) , Sébastien Clément (1) , Sébastien Richeter (1)

1 ICGM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
2 IBMM - Institut des Biomolécules Max Mousseron [Pôle Chimie Balard]

Janus bis(N-heterocyclic carbenes) composed of a porphyrin core with two N-heterocyclic carbenes (NHCs) heads fused to opposite pyrolles were used as bridging ligands for the preparation of metal complexes. We first focused our attention on the synthesis of gold(I) chloride complexes [(NHC)AuCl] and investigated the subsitution of the chloride ligand by acetylides to obtain the corresponding [(NHC)AuCCR] complexes. Polyacetylides were then used to obtain molecular multiporphyrinic systems with porphyrins fused to only one NHC ligand, while main-chain organometallic polymers (MCOPs) were obtained when using Janus porphyrin bis(NHCs). Interestingly, MCOPs incorporating zinc(II) porphyrins proved to be efficient as heterogeneous photocatalysts for the generation of singlet oxygen upon visible light irradiation.

Domaines: Chimie de coordination; Polymères

Jean-François Longevial, Mamadou Lo, Aurélien Lebrun, Danielle Laurencin, Sébastien Clément, et al.. Molecular complexes and main-chain organometallic polymers based on Janus bis(carbenes) fused to metalloporphyrins. Dalton Transactions, In press, 49, pp.7005-7014. ⟨10.1039/D0DT00594K⟩. ⟨hal-02568903⟩