39565-07-6Relevant articles and documents
The First 1-Hydroxypropylidenebisphosphonic Acid with 1,8-Naphthyridinone Substituent: Synthesis and Structure
Bodrin,Pasechnik,Matveeva,Aysin,Matveev,Goryunov,Strelkova,Brel
, p. 1792 - 1799 (2018)
1-Hydroxy-3-(5,7-dimethyl-2-oxo-1,2-dihydro-1,8-naphthyridin-1-yl)propylidenebisphosphonic acid has been synthesized. The structure of the acid and its precursors synthesized for the first time, 3-(5,7-dimethyl-2-oxo-1,2-dihydro-1,8-naphthyridin-1-yl)propionic acid and the corresponding methyl ester, in the solid state and in the DMSO solution has been elucidated by means of vibrational (IR and Raman) and multinuclear (1H, 13C, and 31P) NMR spectroscopy.
1,8-Naphthyridine-Derived Ni2+/Cu2+-Selective fluorescent chemosensor with different charge transfer processses
Li, Zhanxian,Zhao, Wanying,Li, Xiaoya,Zhu, Yanyan,Liu, Chunmei,Wang, Lina,Yu, Mingming,Wei, Liuhe,Tang, Mingsheng,Zhang, Hongyan
, p. 12444 - 12449 (2012)
A highly fluorescent chemosensor based on 1,8-naphthyridine with high sensitivity and selectivity toward Ni2+/Cu2+ over other cations both in aqueous solution over a wide pH range (4-10) and in cellular environments was developed. Counteranions such as acetate, sulfate, nitrate, and perchlorate have no influence on the detection of such metal ions. Ethylenediamine showed high selectivity toward the in situ-prepared Cu 2+ complex over the Ni2+ complex, which can be applied to distinguish Ni2+ and Cu2+. The Ni2+-induced fluorescence on-off mechanism was revealed to be mediated by intramolecular charge transfer from the metal to the ligand, while that by Cu2+ involves intramolecular charge transfer from the ligand to the metal, as confirmed by picosecond time-resolved fluorescence spectroscopy and time-dependent density functional theory calculations.
Synthesis, structures and spectroscopic properties of new 1,2-bis[2-(4-methyl-7-acetylamino-1,8-naphthyridine)]ethylene ligand and its binuclear copper(I) complexes
Li, Zhan-Xian,Li, Cong,Mu, Wei-Hua,Xiong, Shao-Xiang,Fu, Wen-Fu
, p. 7 - 15 (2011)
The synthesis, characterization, spectroscopic properties of a new ligand 1,2-bis[2-(4-methyl-7-acetylamino-1,8-naphthyridine)]ethylene (L) and its two binuclear Cu(I) complexes containing triphenylphosphine (PPh3) or bis(diphenylphosphino)methane (dppm), [Cu2(L)(PPh3) 4](BF4)2·2CH2Cl2 (1·2CH2Cl2) and [Cu2(L)(dppm) 2](BF4)2·4H2O (2·4H2O) are reported. The structural investigation of these compounds based on X-ray crystal analysis shows that the copper(I) centers adopt different coordination geometries, O(N)CuP2+ and NCuP2+ for complexes 1 and 2, respectively. Upon irradiation of a degassed organic solution of L at 365 nm, photoinduced isomerization reaction and an intramolecular proton transfer of ligand L were detailed studied by absorption spectral changes. A spectroscopic investigation involving time-dependent density functional theory calculations allows assignment of the excited states that relate to emission and transient absorption spectra. The observed lower-energy absorption bands appearing in the region of 413 and 418 nm for 1 and 2 in dichloromethane are assigned to ligand-to-ligand charge transfer (LLCT, phosphine → napy) transition in nature. Compared with well-structured solid-state emission originating from ππ transition of ligand L, complexes 1 and 2 exhibit intense room-temperature solid-state emissions with λmax at 586 and 620 nm, respectively. The energy and the shape of the emission bands are clearly different from that of the ligand, indicating the emissions come from different excited states.
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