Energy transfer and formation of long-lived 3MLCT states in multimetallic complexes with extended highly conjugated bis-terpyridyl ligands. Issue 4 (21st September 2015)

• Record Type: Journal Article
• Authors: Wächtler, Maria; Kübel, Joachim; Barthelmes, Kevin; Winter, Andreas; Schmiedel, Alexander; Pascher, Torbjörn; Lambert, Christoph; Schubert, Ulrich S.; Dietzek, Benjamin
• Is Part Of: Physical chemistry chemical physics. Volume 18:Issue 4(2016)
• Page Start: 2350
• Page End: 2360
• Publication Date: 2015-09-21
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c5cp04447b
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : Multimetallic complexes with extended conjugated ligands show efficient energy transfer to the lowest excited states and prolonged Fe(ii ) 3 MLCT lifetimes. Abstract : Multimetallic complexes with extended and highly conjugated bis-2, 2′:6′, 2′′-terpyridyl bridging ligands, which present building blocks for coordination polymers, are investigated with respect to their ability to act as light-harvesting antennae. The investigated species combine Ru(ii )- with Os(ii )- and Fe(ii )-terpyridyl chromophores, the latter acting as energy sinks. Due to the extended conjugated system the ligands are able to prolong the lifetime of the 3 MLCT states compared to unsubstituted terpyridyl species by delocalization and energetic stabilization of the 3 MLCT states. This concept is applied for the first time to Fe(ii ) terpyridyl species and results in an exceptionally long lifetime of 23 ps for the Fe(ii ) 3 MLCT state. While partial energy (>80%) transfer is observed between the Ru(ii ) and Fe(ii ) centers with a time-constant of 15 ps, excitation energy is transferred completely from the Ru(ii ) to the Os(ii ) center within the first 200 fs after excitation.