Search results for "PHENYLENE"

The spectrum of allergic (cross-)sensitivity in clinical patch testing with 'para amino' compounds

2002

Background: Allergic contact sensitization to ‘para amino’ compounds is frequent and the spectrum of cross-reactivity between members of this chemical group is variable. Methods: A retrospective analysis of clinical patch test data obtained with a special test series in the centres of the Information Network of Departments of Dermatology (IVDK) between 1995 and 1999. Results: In the 638 patients tested with the above test panel positive reactions were observed most often to p-aminoazobenzene (16.2%), p-phenylenediamine (14.1%), p-toluylenediamine (10.0%), followed by 4,4′-diaminodiphenylmethane (8.5%), Disperse Orange 3 (8.4%) and p-aminophenol (3.1%). Among the 544 patients tested with p-p…

The concentration of para-phenylenediamine (PPD) for routine patch testing in a standard series needs to be redefined

2005

Interaction of mushroom tyrosinase with aromatic amines, o-diamines and o-aminophenols

2004

3-Amino-L-tyrosine was found to be a substrate of mushroom tyrosinase, contrary to what had previously been reported in the literature. A series of amino derivatives of benzoic acid were tested as substrates and inhibitors of the enzyme. 3-Amino-4-hydroxybenzoic acid, 4-amino-3-hydroxybenzoic acid and 3,4-diaminobenzoic acid were oxidized by this enzyme, as previously reported for Neurospora crassa tyrosinase, but 4-aminobenzoic acid and 3-aminobenzoic acid were not. Interestingly, 3-amino-4-hydroxybenzoic acid was oxidized five times faster than 4-amino-3-hydroxybenzoic acid, confirming the importance of proton transfer from the hydroxyl group at C-4 position. All compounds inhibited the m…

A Theoretical and Experimental Investigation of the Spectroscopic Properties of a DNA-Intercalator Salphen-Type ZnIIComplex

2014

The photophysical and DNA-binding properties of the cationic zinc(II) complex of 5-triethylammonium methyl salicylidene ortho-phenylenediiminato (ZnL 2 + ) were investi- gated by a combination of experimental and theoretical methods. DFT calculations were performed on both the ground and the first excited states of ZnL 2 + and on its possi- ble mono- and dioxidation products, both in vacuo and in selected solvents mimicked by the polarizable continuum model. Comparison of the calculated absorption and fluores- cence transitions with the corresponding experimental data led to the conclusion that visible light induces a two-elec- tron photooxidation process located on the phenylenediimi- nato…

CCDC 911161: Experimental Crystal Structure Determination

2013

Related Article: Jesús Ferrando-Soria, María Castellano, Rafael Ruiz-García, Joan Cano, Miguel Julve, Francesc Lloret, Catalina Ruiz-Pérez, Jorge Pasán, Laura Cañadillas-Delgado, Donatella Armentano, Yves Journaux , Emilio Pardo|2013|Chem.-Eur.J.|19|12124|doi:10.1002/chem.201204484

CCDC 724462: Experimental Crystal Structure Determination

2010

Related Article: E.Nauha, H.Saxell, M.Nissinen, E.Kolehmainen, A.Schafer, R.Schlecker|2009|CrystEngComm|11|2536|doi:10.1039/b905511h

CCDC 1573313: Experimental Crystal Structure Determination

2017

Related Article: Niklas Struch, Filip Topic, Gregor Schnakenburg, Kari Rissanen, Arne Lützen|2018|Inorg.Chem.|57|241|doi:10.1021/acs.inorgchem.7b02412