p-Diethynylbenzene-based molecular wires, Fe–C C-p-C6H2X2–C C–Fe [Fe= Fe(η5-C5Me5)(dppe)]: Synthesis, substituent effects and unexpected formation of benzodifuran complex

2,7-Fluorenediyl-Bridged Complexes Containing Electroactive “Fe(η5-C5Me5)(κ2-dppe)C≡C–” End Groups: Molecular Wires and Remarkable Nonlinear Electrochromes

“…Three additional and much more intense contributions were considered to properly reproduce the observed band shape (B 1 –B 3 ). Such sub-bands are reminiscent of those proposed in near-IR band deconvolutions of the related organoiron MV derivatives 3 [PF 6 ]. , For pseudo-octahedral MV complexes possessing an unpaired electron in the metal d sublevels close in energy to the HOMO-1/HOMO-2 levels, with a sizeable metal–metal interaction mediated by the bridging ligand, these sub-bands possibly correspond to the sought-after IVCT and two interconfigurational transitions. , Thus, the most intense sub-band at lowest energy (B 1 ) is proposed to correspond to the IVCT transition. Consistent with this hypothesis, this sub-band (along with B 2 and B 3 ) is hypsochromically shifted when the dichloromethane solvent is replaced by a solvent with a higher dielectric constant such as acetone or acetonitrile (Figure ).…”

Synthesis, characterization and solid-state photoluminescence studies of six alkoxy phenylene ethynylene dinuclear palladium(ii) rods

“…[9][10][11]14,15 The introduction of side chains into the aromatic moieties has the major advantage of not only increasing solubility, 16,17 but also it facilitates the preparation of thin films, improves interface with other copolymers, 18 contributes to electroluminescence enhancement, 19 inhibits chain-to-chain interactions and also gives more regular polymerizations products, 20 refines emission color shifting in electroluminescent materials, 21 helps improve and tune the formation of thin films for photovoltaic cells 22 as well as increase delocalization and consequently inter-metal communication in binuclear complexes. [23][24][25][26] Moreover, the decrease of the oxidation potential as a result of methyl (donor) β-substitution in thiophene, 27 as well as the decrease in the E g (energy gap, E HOMO -E LUMO ) yielded by methoxy (also donor) substitution in phenylene vinylene oligomers, was previously reported. 28 If Pd-σ-alkynyls are often used for the preparation of homometallic 3,4,[29][30][31][32][33] or heterometallic [34][35][36] (with the incorporation of Ru, Fe or Ni metal centers) organometallic polymers, the synthesis of discrete binuclear Pd rods is comparatively much more scarce and is not so often found in the literature.…”

Electronic and Magnetic Couplings in Free and π-Coordinated 1,4-Diethynylnaphthalene-Bridged [Cp*(dppe)Fe]n+ (n = 0, 1) Units

“…Accordingly, this area constitutes the center of active research from various groups involved in carbon-rich organometallics over the world . In this respect, dinuclear organoiron mixed valence (MV) complexes with two “(Cp*)(dppe)Fe” (Cp* = η 5 -C 5 Me 5 , dppe = 1,2-bis(diphenylphosphino)ethane) redox-active termini connected by a carbon-rich spacer appear particularly appealing as molecular wire models to study the bridge properties. − …”