The Effective Electron‐Transfer Distance in Dinuclear Ruthenium Complexes Containing the Unsymmetrical Bridging Ligand 3,5‐Bis(2‐pyridyl)‐1,2,4‐triazolate

Metal–Metal Electronic Coupling in syn and anti Stereoisomers of Mixed‐Valent (FeCp)2‐, (RhL2)2‐, and (FeCp)(RhL2)‐as‐Indacenediide Ions

“…The delocalisation coefficients α , defined in Equation (6), of 0.085 and 0.064 indicate that the degree of valence delocalisation in the ground state (i.e., the fraction of valence electronic charge transferred) is small and only slightly different in the two isomers. More accurate values of H ab should be obtainable by estimating the true distance r ab 3a. 10a However, if r ab in anti ‐ Fe 2 + and syn ‐ Fe 2 + were significantly shorter than r g , the revised H ab values should still be close to those expected for a moderate metal–metal interaction, according to the Γ values and the weakness of the IT bands.…”

“…In bimetallic complexes and corresponding mixed‐valent derivatives, exact knowledge of the geometric metal–metal distance r g is essential for interpreting electron‐transfer phenomena 1j. 3a, 10 Owing to the flexibility of bimetallic complexes containing spacers of types 1–3 the intermetallic distance is not certain, because in solution the complexes may assume different conformations than that adopted in the crystal structure. Moreover, when the linker is of type 2, it has been recently shown for a series of homobimetallic complexes that through‐space electronic coupling may be of importance 5a…”

Optical Determination of Electron Transfer Dynamics and Kinetics for Asymmetrical [Mo2]–ph–[Mo2] Systems

“…The coupling parameters H MM′ are confirmed by the data H ab calculated from Hush model (Table ). It is recognized that calculation of coupling parameters from eq underestimates the electronic coupling strength when r ab is the distance separating the localized (diabatic) donor and acceptor centroids. − In calculation of H ab , the effective electron transfer distance ( r ′ ab ) is estimated from the size of the phenylene spacer “–CC 6 H 4 C–” in considering that the δ electrons are fully delocalized within the [Mo 2 ] unit via d­(δ)–p­(π) conjugation. ,, For all the complex systems, the results from the two different approaches show excellent consistency with H MM′ / H ab ≈ 1. This is remarkable because major discrepancies between H MM′ and H ab were reported in other donor–acceptor systems. − …”

A new homobimetallic cobalt(II) complex based on the tetradentate 3,5-bis(2-pyridyl)-1H-1,2,4-triazole ligand: Synthesis, crystal structure, Hirshfeld analysis, spectroscopic characterization, magnetic properties and antimicrobial activities

“…Indeed, when the four nitrogen atoms N', N 1 , N 2 et N" of the btp ligand are on the same side, a double-bridged bimetallic complex in close proximity is obtained (cisoid conformation); with metal-to-metal distance varying approximately from 4 to 4.5 Å [7,12,16,19,20]. In contrast, when one pyridine ring rotates 180° to chelate a metal ion with the contribution of the nitrogen atom in position 4, a mono-briged bimetallic complex is obtained (transoid conformation) [15,21,22]. Generally, bpt complexes would prefer the cisoid conformation [16].…”