Synthesis and reactivity of ruthenium cyclopentadienyl [(.eta.5-C5R5)Ru(.eta.6-arene)]PF6 (R = H, CH3) complexes of naphthalene, anthracene, pyrene, chrysene and azulene. Kinetic studies of arene displacement reactions in acetonitrile solutions

Pentamethylcyclopentadienyl organoiron(II) hydrazone complexes: Synthesis, spectroscopic characterization, and second-order nonlinear optical properties. X-ray crystal structure of

“…The data of Table 3 indicate that linear optical properties (i.e., energies and intensities of the absorption bands corresponding to the above-mentioned CT transitions) of 3-6 are in agreement with those reported for other D-p-A systems having the [CpFe(g 6 -arene)] + fragment as electron acceptor linked to an organic or organometallic electron-donating group [13][14][15][16][17][18][19]21]. The broadening of the low-energy band is probably the result of the overlap of broad d-d visible bands of the cationic sandwich fragment [9,45]. For the four compounds 3-6, the two characteristic CT bands exhibit weak bathochromic shifts when the solvent polarity is increased, indicating increased polarity in the excited state.…”

Efficient Synthesis of Tris(acetonitrile)‐(η5‐cyclopentadienyl)‐ ruthenium(II) Hexafluorophosphate via Ruthenocene

“…Complex 4 was placed in an excess of freshly distilled, degassed acetonitrile and the progress of the reaction was monitored by removing aliquots that were then analyzed by 1 H NMR. In keeping with the findings by McNair and Mann, [17] the reaction needed no irradiation and proceeded to completion after stirring at room temperature for 35 h. On a preparative scale, it turned out, however, that product 1 was contaminated by small amounts (3 ± 6%) of the naphthalene complex 4. We concluded that evaporation to dryness and sublimation of liberated naphthalene at room temperature regenerated small quantities of 4.…”

“…Naphthalene complexes undergo facile haptotropic slippage [14] and the kinetics of arene displacement in 4 by acetonitrile were studied by McNair and Mann close to 20 years ago. [17] They reported the half-life for the pseudo-first order substitution of naphthalene in 4 by acetonitrile to be ca. 4.7 h at 22 8C.…”

Selective Ruthenium Labeling of the Tryptophan Residue in the Bee Venom Peptide Melittin

“…We found that irradiation of melittin ( 1 ) with the commercially available ruthenium complex [(C 5 H 5 )Ru(naphthalene)] + ( 2 ) in aqueous solution and in air gave the organometallic derivative of melittin 3 (>95 % yield by NMR, 82 % isolated yield after HPLC purification; Scheme ). The maximum of light absorption of 2 is in the near‐ultraviolet region ( λ max =364 nm),9 so a household manicure lamp ( λ max =365 nm) was found to be the most convenient and efficient irradiation source. At the same time, the absorption band of 2 is wide enough to make the reaction feasible under intensive visible light irradiation ( λ >400 nm).…”