64691-33-4Relevant academic research and scientific papers
Copper(I) Phosphinooxazoline Complexes: Impact of the Ligand Substitution and Steric Demand on the Electrochemical and Photophysical Properties
Frey, Wolfgang,Giereth, Robin,Karnahl, Michael,Klo?, Marvin,Mengele, Alexander K.,Steffen, Andreas,Tschierlei, Stefanie
supporting information, p. 2675 - 2684 (2020/03/04)
A series of seven homoleptic CuI complexes based on hetero-bidentate P^N ligands was synthesized and comprehensively characterized. In order to study structure–property relationships, the type, size, number and configuration of substituents at the phosphinooxazoline (phox) ligands were systematically varied. To this end, a combination of X-ray diffraction, NMR spectroscopy, steady-state absorption and emission spectroscopy, time-resolved emission spectroscopy, quenching experiments and cyclic voltammetry was used to assess the photophysical and electrochemical properties. Furthermore, time-dependent density functional theory calculations were applied to also analyze the excited state structures and characteristics. Surprisingly, a strong dependency on the chirality of the respective P^N ligand was found, whereas the specific kind and size of the different substituents has only a minor impact on the properties in solution. Most importantly, all complexes except C3 are photostable in solution and show fully reversible redox processes. Sacrificial reductants were applied to demonstrate a successful electron transfer upon light irradiation. These properties render this class of photosensitizers as potential candidates for solar energy conversion issues.
Copper Photosensitizers Containing P^N Ligands and Their Influence on Photoactivity and Stability
Giereth, Robin,Frey, Wolfgang,Junge, Henrik,Tschierlei, Stefanie,Karnahl, Michael
, p. 17432 - 17437 (2017/12/15)
Driven by the intention to improve classic heteroleptic copper photosensitizers two novel Cu(I) complexes applying a hetero-bidentate P^N ligand were prepared. A combined photophysical, electrochemical, and theoretical study gives insights into structure–activity relationships and revealed an increased absorptivity. Both complexes were tested for the light-driven production of H2.
Highly efficient synthesis of (Phosphinodihydrooxazole)- (1,5-cyclooctadiene) Iridium complexes
Semeniuchenko, Volodymyr,Khilya, Volodymyr,Groth, Ulrich
experimental part, p. 1147 - 1158 (2010/03/02)
A highly efficient one-pot procedure for the synthesis of complexes of the type [Ir(COD)(Phox)]X, where Phox is a (chiral) phosphinooxazoline ligand, X = PF6 or B[(3,5-(CF3)2C6H 3)]4 (BARF), is developed. Former reported syntheses demanded the isolation of pure ligands by column chromatography, but the ligands tend to adsorb irreversibly on silica. Moreover, the chromatography has to be performed with careful exclusion of air. The present method avoids this difficulties. The yields of the syntheses are comparable with those starting from the pure ligands. The method is also suitable for the preparation of complexes of the type [Rh(COD)(Phox)]BARF and [Rh(Phox)2]BARF.
Synthesis and structural characterization of new phosphinooxazoline complexes of iron
Sedinkin, Sergey L.,Rath, Nigam P.,Bauer, Eike B.
, p. 3081 - 3091 (2008/12/22)
The first phosphinooxazoline chelate complexes of iron were synthesized, and their structural and electronic properties were studied. The known phosphinooxazolines 2-(2-(diphenylphosphino)phenyl)-4,5-dihydrooxazole (7a), 2-(2-(diphenylphosphino)phenyl)-4,
Homogeneous hydrogenation of tri- and tetrasubstituted olefins: Comparison of iridium-phospinooxazoline [Ir-PHOX] complexes and crabtree catalysts with hexafluorophosphate (PF6) and tetrakis[3,5-bis(trifluoromethyl) phenyl]borate (BArF
Wuestenberg, Bettina,Pfaltz, Andreas
supporting information; experimental part, p. 174 - 178 (2009/04/07)
Four iridium complexes with achiral phosphino-oxazoline (PHOX) ligands were readily prepared in two steps starting from commercially available phenyloxazolines. The air-stable complexes with tetrakis[3,5- bis(trifluoromethyl)phenyl]borate (BArF
Nickel(II) complexes bearing phosphinooxazoline ligands: Synthesis, structures and their ethylene oligomerization behaviors
Tang, Xiubo,Zhang, Dongheng,Jie, Suyun,Sun, Wen-Hua,Chen, Jiutong
, p. 3918 - 3928 (2007/10/03)
A series of Ni(II) complexes 4a-f ligated by the unsymmetrical phosphino-oxazolines (PHOX) were synthesized and characterized by elemental analysis and IR spectroscopy, and the structures of complexes 4c-4e were confirmed by the X-ray crystallographic analysis. All derivatives showed distorted tetrahedron geometry by the nickel center and coordinative atoms. Upon activation with methylaluminoxane (MAO) or Et2AlCl, these complexes exhibited considerable to high activity of ethylene oligomerization. The ligands environments and reaction conditions significantly affect their catalytic activities, while the highest oligomerization activity (up to 1.18 × 106 g ? mol-1(Ni) ? h-1) was observed for 4d at 20 atm of ethylene. Incorporation of 2-4 equivalents of PPh 3 as auxiliary ligands in the 4a-f/MAO catalytic systems led to higher activity and longer catalytic lifetime.
Preparation of chiral phosphorus, sulfur and selenium containing 2-aryloxazolines
Peer, Markus,De Jong, Johannes C.,Kiefer, Matthias,Langer, Thomas,Rieck, Heiko,Schell, Heico,Sennhenn, Peter,Sprinz, Juergen,Steinhagen, Henning,Wiese, Burkhard,Helmchen, Guenter
, p. 7547 - 7583 (2007/10/03)
A series of enantiomerically pure 2-[2-(diarylphosphino)aryl]-oxazolines was prepared from commercially available or synthetic amino alcohols. For oxazoline formation three procedures were employed: (i) one pot condensation with a 2-halobenzoic acid (ii) ZnCl2 catalyzed condensation with a 2-halobenzonitrile, and (iii) a three step sequence via a 2-halobenzamide and a tosylate or chloride. Phosphinooxazolines containing stereogenic phosphorous were prepared by either diastereoselective nucleophilic substitution of halogenide of Ar1Ar2PCl or by nucleophilic aromatic substitution with LiPAr1Ar2. In addition, sulfur and selenium analogs were prepared.
DICHOTOMOUS REACTION PATHWAYS IN THE REACTION OF TRIARYLPHOSPHINE OXIDES WITH MEERWEIN'S SALT
Crich, David,Dyker, Hubert
, p. 475 - 476 (2007/10/02)
Addition of triphenylphosphine oxide to triethyloxonium tetrafluoroborate leads to the formation of ethoxytriphenylphosphonium tetrafluoroborate in high yield, whereas inverse addition leads an oxygen bridged diphosphonium salt.
