19414-67-6Relevant articles and documents
Synthesis and spectroscopic studies of axially bound tetra(phenothiazinyl)/tetra(bis(4′-tert-butylbiphenyl-4-yl)aniline)-zinc(II)porphyrin-fullero[C60 and C70]pyrrolidine donor-acceptor triads
Jain, Kanika,Duvva, Naresh,Badgurjar, Deepak,Giribabu, Lingamallu,Chitta, Raghu
, p. 5 - 10 (2016)
Two zinc porphyrin based dyads, 5, 10, 15, 20-tetra-4-(2-(10H-phenothiazin-10-yl)ethoxy)phenyl porphyrinato zinc (II) and 5,10,15,20-tetra-4-(bis(4′-tert-butylbiphenyl-4-yl)amino)phenyl porphyrinato zinc(II) containing four phenothiazine or bis(4′-tert-bu
Studies on some new meso-aryl substituted octabromo-porphyrins and their Zn(II) derivatives
George, Regimol G.,Padmanabhan
, p. 3145 - 3154 (2003)
A series of porphyrins with various tolyl (H2TTHP) and naphthyl substituents (H2TNHP) at the meso-positions, their octabromoderivatives (H2TTBP and H2TNBP) with Br substituents at β-pyrrole positions and also their Zn(II) derivatives have been synthesised and characterised by 1H NMR, electronic, fluorescence and electrochemical studies. These have the meso-carbons bonded to tolyl moieties at ortho-, meta- and para-positions of the tolyl groups and at the α- or β-position of the naphthyl group. For the octabromoporphyrins, pronounced deshielding of NH protons and a moderate shift of meso-aryl protons to a lower δ value are observed compared to their nonbrominated species. The electronic spectra of ZnTTHP and ZnTNHP have almost the same B and Q bands while the B band of their free-base analogues have H 2TNHP absorbing at a higher wavelength than H2TTHP. All the octabromoderivatives exhibit a pronounced red shift for both B and Q bands (compared to their nonbrominated forms) and show meso-substituent dependent change in both free-base and metallated forms. The above observations are interpreted in terms of moderate conjugative interaction of the aryl substituent with the π framework and also in terms of energy level reordering which alters the HOMO-LUMO gap. Consistent with the absorption spectral data the emission bands of all the bromoporphyrins were also seen to be red shifted considerably. Significant decrement in quantum yield (φf) was observed for the bromocompounds. While the φf of nonbrominated porphyrins is seen to be higher than their Zn(II) derivatives the reverse order is observed for the bromoderivatives. The ability of the Zn2+ ion to make the bromoporphyrins resistant to distortion by bridging the central cavity can be attributed as the cause for this interesting observation. Cyclic voltammetric studies exhibit characteristic quasi-reversible/irreversible oxidation-reduction features for all the free-bases and Zn(II) derivatives. The bromoderivatives on the other hand manifest marginally harder oxidation and very easy reduction features. The data are interpreted in terms of electron withdrawing ability of Br atoms and to reordering of HOMO and LUMO levels due to distortion in the porphyrin ring.
ANTIMICROBIAL AGENT FOR THE BIOCIDAL FINISH OF POLYMERS
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Paragraph 0020, (2017/11/29)
An antimicrobial agent for the biocidal finish of polymers based on biocides is described, whose molecules have at least one nitrogen atom with a free electron pair. In order to achieve an extensive insolubility without loss of the biocidal effect, it is
Pitfalls in bromination reactions of zinc porphyrins: Two-sided ring opening of the porphyrin macrocycle
Nandi, Goutam,Titi, Hatem M.,Goldberg, Israel
supporting information, p. 7894 - 7900 (2014/08/18)
Reaction of [ZnII(TTP)] (1) (TTP = dianion of 5,10,15,20-meso-tetrakis(p-tolyl)porphyrin) with 16 equiv of N-bromosuccinamide (NBS) in methanol at reflux led to the unexpected two-sidedd open-ring brominated product [ZnII(C26H20N 2O2Br5)2] (2). Similar observations have been made with other meso-substituted zinc porphyrins as well [Zn II(por)] {por = dianion of 5,10,15,20-meso-tetrakis(aryl)porphyrin; aryl = phenyl (TPP), p-tBu-phenyl (TBPP), m-Cl-phenyl (TClPP)}. The respective products [ZnII(C24H16N 2O2Br5)2] (3), [Zn II(C32H32N2O2Br 5)2] (4), and [ZnII(C24H 14N2O2Cl2Br5) 2] (5) have been isolated in good to moderate yields and characterized by elemental analysis and UV-vis, 1H NMR, and mass spectrometry. Additional bromination reaction of 1 with 8 equiv of NBS in a chloroform/methanol mixture led (after the two-sided ring opening) to nonmetalated brominated bi(pyrrole) product, C36H34N 2O4Br4 (6). The detailed structures of complexes 1, 2, 3, and 6, available in a single crystal form, have been confirmed by X-ray diffraction analysis.
