3882-45-9Relevant academic research and scientific papers
An investigation on the second-order NLO properties of novel cationic cyclometallated Ir(III) complexes of the type [Ir(2-phenylpyridine) 2(9-R-4,5-diazafluorene)]+ (R = H, fulleridene) and the related neutral complex with the new 9-fulleriden-4-monoazafluorene ligand
Dragonetti, Claudia,Valore, Adriana,Colombo, Alessia,Righetto, Stefania,Rampinini, Giovanni,Colombo, Francesca,Rocchigiani, Luca,MacChioni, Alceo
, p. 72 - 78 (2012)
Novel cationic cyclometallated Ir(III) complexes bearing diaza- or monoazafluorene substituted or not with a C60-fullerene moiety have been synthesized together with a novel interesting ligand 9-fulleriden-4- monoazafluorene and the related Ir(III) neutral complex [Ir(ppy) 2(9-fulleriden-4-monoazafluorene)]. All complexes show a negative large value of μβ1.907 (-600 to -2190 × 10 -48 esu), as determined by the Electric Field Induced Second Harmonic generation (EFISH) technique working at 1.907 μm in 10-3 M CH2Cl2 solution. The NLO response increases upon introduction of the fullerene moiety, due to a decrease of the interaction forces between the anion and cation within the ion pair which leads to an increase of the percentage of free ions, as evidenced by diffusion NMR experiments. Besides, it appeared that for the neutral complex [Ir(ppy) 2(9-fulleriden-4-monoazafluorene)] the EFISH μβ 1.907 value is lower than that of cationic Ir(III) complexes, but comparable or slightly lower to the values of other neutral Ir(III) complexes such as [Ir(ppy)2(RCOCR′COR)] (ppy = cyclometallated 2-phenylpyridine; R = Me, Ph; R′ = H, 2,4-dinitrophenyl), confirming that the second-order NLO response of these neutral chromophores is dominated by ILCT processes concerning cyclometallated 2-phenylpyridines.
Benzodiazepine derivatives useful as CCK-receptor antagonists
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, (2008/06/13)
This invention relates to benzodiazepine derivatives which are useful as drugs exhibiting antagonism at the gastrin and/or CCK-B receptor, and to their production.
Cyclising Nucleophilic Addition to Azinium Systems. Part 2. Reactions of 3-Acylpyridinium Hydrazones.
Street, Jonathan D.,Baradarani, M. Mehdi,Beddoes, Roy L.,Mills, Owen S.,Joule, John A.
, p. 1247 - 1285 (2007/10/02)
3-Acyl-1-methylpyridinium tosyl- and benzoylhydrazines lose a side-chain N-hydrogen on treatment with mild base thus forming zwitterions, isolable in some cases; intramolecular nucleophilic cyclising addition to the pyridinium nucleus in these was observe
