Photoinduced processes in 4′-(9-anthryl)-2,2′:6′,2″-terpyridine, its protonated forms and Zn(II), Ru(II) and Os(II) complexes

Albano, G.; Balzani, Vincenzo; Constable, Edwin C.; Maestri, Matteo; Smith, Diane R.

doi:10.1016/s0020-1693(97)06159-8

Cited by 145 publications

(110 citation statements)

References 37 publications

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“…It is known from literature that polypyridylruthenium complexes are able to create singlet oxygen which can be used in organic transformations which can also be exploited for the preparative catalytic oxidation of citronellol. [12][13][14][15] In an attempt to prepare the free dpbqz ligand using intermolecular photoinduced process, bdppz was mixed with the tris(2,2Ј-bipyridine)ruthenium(II) cation under aerobic conditions in acetonitrile and illuminated as with 1 for 48 h. The oxidation of the bdppz ligand is observed but the yield is much more modest (approximately 15 % conversion).…”

Section: Resultsmentioning

confidence: 99%

Photoinduced Ligand Transformation in a Ruthenium Polypyridophenazine Complex

et al. 2008

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Section: Resultsmentioning

confidence: 99%

Photoinduced Ligand Transformation in a Ruthenium Polypyridophenazine Complex

et al. 2008

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“…(4Ј-phenyl)-2,2Ј:6Ј,2ЈЈ-terpyridine (ph-tpy) and (4Ј-pyrenyl)-2,2Ј:6Ј,2ЈЈ-terpyridine (py-tpy), were prepared by reported procedures. [72][73][74] The elemental analysis was done using a Thermo Finnigan Flash EA 1112 CHNS analyzer. The infrared and electronic spectra were recorded on Perkin-Elmer Lambda 35 and Perkin-Elmer Spectrum one 55 spectrophotometers, respectively.…”

Section: Methodsmentioning

confidence: 99%

Terpyridine Oxovanadium(IV) Complexes of Phenanthroline Bases for Cellular Imaging and Photocytotoxicity in HeLa Cells

et al. 2011

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Oxovanadium(IV) complexes [VO(N‐N‐N)(N‐N)](NO3)2 (1–4) of (4′‐phenyl)‐2,2′:6′,2″‐terpyridine (ph‐tpy in 1 and 2) or (4′‐pyrenyl)‐2,2′:6′,2″‐terpyridine (py‐tpy in 3 and 4) having N‐N as 1,10‐phenanthroline (phen in 1 and 3) or dipyrido[3,2‐a:2′,3′‐c]phenazine (dppz in 2 and 4) are prepared and characterized. The crystal structure of 1 has VO2+ group in VN5O coordination geometry. The terpyridine ligand coordinates in a meridional binding mode. The phen ligand displays a chelating mode of binding with an N‐donor site trans to the vanadyl oxo group. The complexes show a d‐d band in the range of 710–770 nm in aqueous DMF (4:1 v/v). The complexes exhibit an irreversible VIV/VIII redox response near –1.0 V vs. SCE in aqueous DMF/0.1 M KCl. The complexes bind to CT DNA giving Kb values within 3.5 × 105 to 1.2 × 106 M–1. The complexes show poor chemical nuclease activity in dark. Complexes 2–4 show photonuclease activity in UV‐A light of 365 nm forming 1O2 and ·OH. Complex 4 shows DNA photocleavage activity at near‐IR light of 785 nm forming ·OH radicals. Complexes 2 and 4 show significant photocytotoxicity in HeLa cancer cells. Uptake of the complexes in HeLa cells, studied by fluorescence imaging, show predominantly cytosolic localization inside the cells.

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“…10 The parent 1,10-phenathroline possesses a low fluorescence quantum yield (Φ ≤0.01) and a rather short emission wavelength (λ em ≈360 nm). 12 Since the most intense electronic transition of the 1,10-phenanthroline skeleton is polarized along the 3-8 positions, 13 they hypothesized that increasing the conjugation along this axis may provide fluorescent derivatives with emission in the visible range, and have therefore synthesized 3,8-bis(arylethynyl)-1,10-phenanthrolines (1) as novel fluorescent chromophores (Fig.…”

Section: Fig 1 the Basic Structures Composing Of Polypyridine Compomentioning

confidence: 99%

The Recent Current of Fluorescent Polypyridine Compounds Having Photofuctionality

Choi¹

2016

Rapid Communication in Photoscience

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Many kinds of fluorescent polypyridine compounds including bpy and dppz derivatives are described in understanding the recent current of fluorescent materials having photofuctionality. Those polypyridine compounds have the photofunctionality such as the fluorescence recognition and/or photo-switching. Furthermore, those compounds are applicated for the construction of long ranged photoinduced electron/energy transfer system. Various fluorescent π-conjugation systems connected by amide or imine bond as well as the simple fluorescent bpy derivatives are introduced in this review paper. INTRODUCTIONFluorescent artificial receptors are attracting considerable interest in various stages in sensory, biochemical, medical, photoelectronic, and other fields.1 These receptors are composed of the host unit (binding site) and the signaling unit (fluorescent site), and communication between the two units is essential for guest specific response. Though various molecular designs have been proposed in order to develop efficient fluorescent receptors, 2 most of those receptors are designed by introducing molecular recognition site(s) into the known fluorophores.Polypyridine compounds are useful molecular units as a binding site. They have multiple interaction sites, and the number of pyridine units is adjustable. 2,2'-Bipyridine (bpy) is most studied among them due to its excellent property as a bidentate ligand and as a hydrogen bond acceptor.3 Moreover, rational receptor design using more than one bpy can reach selective and strong interaction with guests.

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Photoinduced processes in 4′-(9-anthryl)-2,2′:6′,2″-terpyridine, its protonated forms and Zn(II), Ru(II) and Os(II) complexes

Cited by 145 publications

References 37 publications

Photoinduced Ligand Transformation in a Ruthenium Polypyridophenazine Complex

Photoinduced Ligand Transformation in a Ruthenium Polypyridophenazine Complex

Terpyridine Oxovanadium(IV) Complexes of Phenanthroline Bases for Cellular Imaging and Photocytotoxicity in HeLa Cells

The Recent Current of Fluorescent Polypyridine Compounds Having Photofuctionality

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