Substituted cyclopentadienyl compounds

Synthesis and Characterization of Dibromo-Containing Ruthenium(IV) η3-Allyl and Ruthenium(IV) η4-Diene Complexes. Formation of [Ru(η5-C5Me5)Br3]- and [Ru(η5-C5Me5)Br3]2

“…9 20 The 1 H NMR spectrum of 16b is similar to that of 16a and is not discussed here . For comparison, the geminal coupling constants for terminal CH 2 of Zr(η 5 -C 5 H 5 ) 2 (η 4 -CH 2 CMeCMeCH 2 ) and Ta(η 5 -C 5 Me 5 ) 2 (η 4 -CH 2 CMeCMeCH 2 )Cl 2 are equal 10.0 and 7.2 Hz, respectively. 20b,e As noted previously, the solution 1 H NMR spectra of 16a , b are solvent dependent tentatively interpreted as an ion-pairing phenomenon. While in low dielectric solvents, such as CDCl 3 , ion-pairing between the cationic part of 16a and the counterion is favored, in the moderate dielectric solvents CD 3 CN and C 2 D 5 OD the complexes 16a , b are largely dissociated.…”

Silver(I) Coordination Polymers of Fluorescent Oligo(phenylenevinylene) with π−π Stackings: Luminescence and Conductivity

“…Conjugated organic π-systems in rings and chains have captured considerable interest from many research groups and have been used to construct intriguing organometallic complexes with potential application in nonlinear optics, electronics, and molecular electronics. − The delocalized π-bridges provide an effective pathway for electronic transfer between the two metal centers across these bridging ligands. In the past decade, polyenes and polycyclic aromatic hydrocarbons have been extensively employed to develop metal−organic frameworks with novel structures and conductive properties. ,− Oligo(phenylenevinylene) is another kind of π-conjugated compound. , However, nothing is known about the reaction behavior toward transition metal ions, although the polymeric oligo(phenylene)-ynes containing transition metals in the main chain were synthesized. − ,, In recent years, we have been interested in the construction of silver(I) complexes with π-conjugated polycyclic aromatic hydrocarbons and polyenes. ,,,,, As an extension of these studies, two fluorescent oligo(phenylenevinylene)s, 1,4-bis(methylstyryl)benzene (bmsb), and 4,4‘-bis(2,5-dimethylstryryl)biphenyl (bdb) were selected as ligands in this study (Chart ) to construct the luminescent silver(I) coordination polymers with aromatic stackings. The reaction of bmsb and bdb with different silver(I) salts afforded three novel luminescent silver(I) coordination polymers: [Ag 2 (bmsb)(ClO 4 ) 2 ] ( 1 ), [Ag 2 (bmsb)(H 2 O) 4 ](BF 4 ) 2 ( 2 ), and [Ag 2 (bdb)(CF 3 SO 3 ) 2 ] ( 3 ).…”