167897-41-8Relevant academic research and scientific papers
Determination of amino acid enantiopurity and absolute configuration: Synergism between configurationally labile metal-based receptors and dynamic covalent interactions
Scaramuzzo, Francesca A.,Licini, Giulia,Zonta, Cristiano
, p. 16809 - 16813 (2013)
Reliable determination of the enantiomeric excess of free amino acids can be obtained by measuring the induced circular dichroism of a multicomponent assembly formed by a modified tris(2-pyridylmethyl)amine ligand, a zinc salt, and the amino acid of inter
Tuning the reactivity and efficiency of copper catalysts for atom transfer radical polymerization by synthetic modification of tris(2-methylpyridyl)amine
Carmo dos Santos, Nadia Alessandra,Lorandi, Francesca,Badetti, Elena,Wurst, Klaus,Isse, Abdirisak Ahmed,Gennaro, Armando,Licini, Giulia,Zonta, Cristiano
, p. 169 - 176 (2017)
Copper complexes bearing ligands based on tris(2-methylpyridyl)amine (TPMA) are leading catalysts in atom transfer radical polymerization (ATRP). In recent years, the TPMA structure has been finely modified to enhance the catalytic activity of the corresp
Photoinduced hydrogen evolution with new tetradentate cobalt(ii) complexes based on the TPMA ligand
Natali, Mirco,Badetti, Elena,Deponti, Elisa,Gamberoni, Marta,Scaramuzzo, Francesca A.,Sartorel, Andrea,Zonta, Cristiano
supporting information, p. 14764 - 14773 (2016/09/28)
Hydrogen production from water splitting is nowadays recognized as a target, fundamental reaction for the production of clean fuels. Indeed, tremendous efforts have been devoted towards the research of suitable catalysts capable of performing this reaction. With respect to heterogeneous systems, molecular catalysts such as metal complexes are amenable to chemical functionalization in order to fine tune the catalytic properties. In this paper a new class of tris(2-pyridylmethyl)-amine (TPMA) cobalt(ii) complexes (CoL0-4) has been synthesized and employed as hydrogen evolving catalysts under photochemical conditions taking advantage of Ru(bpy)32+ (where bpy is 2,2′-bipyridine) as a light-harvesting sensitizer and ascorbic acid as a sacrificial electron donor. Tuning of the photocatalytic activity has been attempted through the introduction of different substituents at the catalyst periphery rather than through a direct chemical modification of the chelating TPMA ligand. The results show that CoL0-4 behave as competent hydrogen evolving catalysts (HECs), although the effects played by the different substituents on the catalysis are relatively modest. Possible reasons supporting the observed behavior as well as possible improvements of the aforementioned tuning approach are discussed.
Influence of water on the formation of O2-reactive divalent metal enolate complexes of relevance to acireductone dioxygenases
Grubel, Katarzyna,Ingle, Gajendrasingh K.,Fuller, Amy L.,Arif, Atta M.,Berreau, Lisa M.
experimental part, p. 10609 - 10620 (2011/12/22)
Reaction conditions were evaluated for the preparation of [(6-PhTPA)Ni(PhC(O)C(OH)C(O)Ph)]ClO4 (3) and [(6-Ph 2TPA)Co(PhC(O)C(OH)C(O)Ph)]ClO4 (7), two complexes of structural relevance to the enzyme/substrate (ES) adduct in Ni(ii)- and Co(ii)-containing forms of acireductone dioxygenase. The presence of water in reactions directed at the preparation of 3 and 7 was found to result in isomerization of the enolate precursor 2-hydroxy-1,3-diphenylpropane-1,3-dione to give the ester 2-oxo-2-phenylethylbenzoate. Performing synthetic procedures under dryer conditions reduced the amount of ester production and enabled the isolation of 3 in high yield. This complex was comprehensively characterized, including by X-ray crystallography. Using similar conditions for the 6-Ph 2TPACo-containing system, the amount of ester generated was only modestly affected, but the formation of a benzoate complex ([(6-Ph 2TPA)Co(O2CPh)]ClO4, 10) resulting from ester hydrolysis was prevented. The best preparation of 7 was found to involve dry conditions and short reaction times. The approach outlined herein toward determining appropriate reaction conditions for the preparation of 3 and 7 involved the preparation and characterization of several air-stable (6-PhTPA)Ni- and (6-Ph2TPA)Co-containing analog complexes having enolate, solvent, and benzoate ligands. These complexes were used as paramagnetic 1H NMR standards for evaluation of reaction mixtures containing 3 and 7.
Biomimetic aryl hydroxylation derived from alkyl hydroperoxide at a nonheme iron center. Evidence for an FeIV=O oxidant
Jensen, Michael P.,Lange, Steven J.,Mehn, Mark P.,Que, Emily L.,Que Jr., Lawrence
, p. 2113 - 2128 (2007/10/03)
Many nonheme iron-dependent enzymes activate dioxygen to catalyze hydroxylations of arene substrates. Key features of this chemistry have been developed from complexes of a family of tetradentate tripodal ligands obtained by modification of tris(2-pyridyl
