Synthesis and molecular hyperpolarisabilities of donor–acceptor bipyridyl metal complexes (M=Re, Zn, Hg)

Dipolar and Non-Dipolar Pyridine and Bipyridine Metal Complexes for Nonlinear Optics

“…[57] This difference could be explained by the relevant parameter for poled polymer applications, compared well with that of the prototypical chromophore dis-transoid conformation of the bipyridine ligands and thus to the presence of opposed charge-transfer excited states which perse red 1 [µ·β(0) ϭ 450 ϫ 10…”

“…Larger values ited two less intense bands assigned to MLCT and πϪπ* transitions, respectively. [28b,56] The EFISH measurements of of β were observed with Pt II metal ions and dithiolate ligands containing electron-donating substituents such as in 13 and 14 at 1.34 µm [57] indicated moderate β values ranging from 4 to 14 ϫ 10 Ϫ30 esu; the most efficient donor 11. In contrast, complexes 10 with dithiolate ligands containing electron-withdrawing groups exhibited reduced β group was, as expected, dibutylaminophenyl [4-Bu 2 NϪC 6 H 4 ->> 4-ROϪC 6 H 4 -ഠ (C 5 H 5 )Fe(C 5 H 4 -) > values: a decrease of the electron-donating strength of the dithiolate and the presence of another charge-transfer-to-(C 5 H 5 )Ru(C 5 H 4 -)].…”

Self-assembled monolayers of ruthenocene-substituted biphenyl ethynyl thiols on gold

“…Recent studies on dinuclear ruthenocene compounds bridged by oligoenes and oligoynes of different chain length in solution showed that such compounds are potential two-electron reservoirs with a stable and reversible redox system [20,21]. In addition, ruthenocene derivatives are under study for such varied aspects as biomedical applications [22], photochemistry [23], catalysis [24,25], and non-linear optics [26]. As for the SAMs, only a number of other Ru complexes including the cyclometallated complex [Ru(2,2 0 -bipyridine) 2 (2-(2 0 -ylphenyl)pyridine)] + [27,28], the redox complex [Ru(NH 3 ) 6 ] 3+/2+ [29][30][31], and [Ru(g 5 -C 5 H 5 )(g 4 -C 5 H 4 O)] + [32] anchored to SAMs have been studied, mainly in view of their electrochemical performance.…”

Heptametallic, Octupolar Nonlinear Optical Chromophores with Six Ferrocenyl Substituents

“…Since the seminal report by Green, Marder and colleagues, [15] many investigations into quadratic NLO properties have exploited the Fc group (or its methylated derivatives). [18] Various poly-Fc molecules (including dendrimers and functionalised clusters) have been reported, [19] largely of interest for their multi-electron redox properties, but the NLO behaviour of such species remains unexplored to our knowledge. [3a,b, 16k] Other previous studies have noted SHG from mono-bpy complexes of Re I or Zn II with a single Fc substituent.…”