Confined synthesis of homogeneous Tetrakis(triphenyl phosphine) palladium within hollow porous polymeric nanospheres for catalysis application

2021 ◽  
pp. 111155
Author(s):  
Haitao Yu ◽  
Ying Liu ◽  
Li Zhang ◽  
Shengguang Gao ◽  
Chunmei Song ◽  
...  
Keyword(s):  
Triphenyl Phosphine ◽  
Polymeric Nanospheres

Organothallium compounds. VII. β-Diketonatobis(pentafluorophenyl)-thallium(III) compounds and their coordination derivatives

1971 ◽  
Vol 24 (12) ◽  
pp. 2519 ◽  
Author(s):  
GB Deacon ◽  
VN Garg
Keyword(s):  
Molecular Weight ◽  
Phosphine Oxide ◽  
Spectroscopic Data ◽  
Triphenyl Phosphine ◽  
Organothallium Compounds ◽  
Triphenyl Phosphine Oxide

The complexes (C6F5)2TlX [X = MeCOCHCOMe (acac), CF3COCHCOMe (tfac), CF8COCHCOCF3 (hfac), PhCOCHCOMe (bzac), PhCOCHCOPh (dbm), or quinolin-8- olate (oxinate or ox)], have been prepared by reactions between bromobis(pentafluorophenyl)thallium(III) and the appropriate sodium or thallous β-diketonates or sodium quinolin-8-olate, and react with equimolar amounts of 1,10-phenanthroline (phen) or 2,2?-bipyridyl (bipy) to give the complexes (C6F5)2- (phen or bipy)TlX (X = acac, tfac, or hfac), (C6F5)2(phen)TlX (X = bzac, dbm, or ox), but not (C6F5)2(bipy)TlX (X = bzac, dbm, or ox). On reaction with triphenyl- phosphine oxide or triphenylarsine oxide, the complexes (C6F5)2(Ph3PO or Ph3AsO)-TlX (X = acac, tfac, hfac, or dbm) and (C6F5)2Ph3AsOTl(ox) have been obtained. From conductance and molecular weight measurements and spectroscopic data, the complexes (C6F5)2TlX (except X = ox), (C6F5)2(Ph3PO or Ph3AsO)TlX, and (C6F5)2(phen or bipy)TlX, are considered to be monomeric with chelated β-diketonate or oxinate groups, and hence to contain four-, five-, and six-coordinate thallium respectively, whereas (C6F5)2Tl(ox) is considered to have an associated structure with bridging oxinate groups.

Comparison and Synthesis of Molybdenum Carbonyl Complexes Substituted with Mono- and Bis-Triphenylphosphine Ligands for Hydrocracking of Vacuum Residue

2021 ◽  
Vol 21 (7) ◽  
pp. 4085-4088
Author(s):  
Sung Hyeon Kim ◽  
Byeong Min Choi ◽  
Sun Yeong Park ◽  
Ki Hyuk Kang ◽  
MinChul Chung ◽  
...  
Keyword(s):  
Coke Formation ◽  
Energy Industry ◽  
Vacuum Residue ◽  
Heavy Oils ◽  
Carbonyl Complexes ◽  
Triphenyl Phosphine ◽  
Thermal Decomposition Behavior ◽  
Similar Weight ◽  
Molybdenum Carbonyl ◽  
Decomposition Behavior

(PPh3)Mo(CO)5 and (PPh3)2Mo(CO)4 were synthesized by the reaction of molybdenum hexacar-bonyl with triphenylphosphine and applied as precursors to hydrocracking of vacuum residue under high-pressure and high-temperature conditions. (PPh3)2Mo(CO)4 could also be synthesized by the reaction of (PPh3)Mo(CO)5 with triphenyl phosphine. A commercial precursor (Mo-octoate) for hydrocracking of vacuum residue was used for comparison. The thermal decomposition behavior of (PPh3)Mo(CO)5, (PPh3)2Mo(CO)4, and Mo-octoate was also examined by the thermogravimetric analysis. The TGA curve of (PPh3)Mo(CO)5 and (PPh3)2Mo(CO)4 showed a similar weight-loss pattern. (PPh3)Mo(CO)5 and (PPh3)2Mo(CO)4 were decomposed into Mo metal and ligands rapidly in the range of 140 °C~270 °C. There were no ligands bound to a metal center of (PPh3)Mo(CO)5 and (PPh3)2Mo(CO)4 at the reaction temperature (430 °C) of hydrocracking. The amount of coke formed after hydrocracking over (PPh3)Mo(CO)5 and (PPh3)2Mo(CO)4 was 2.3% and 0.5%, respectively. Upgrading the qualities of heavy oils is an important issue in the energy industry. It is not easy to achieve the complete conversion of vacuum residue due to coke forming during hydrocracking of vacuum residue. This study showed that (PPh3)2Mo(CO)4 was considerably effective in reducing coke formation.

Building new discrete supramolecular assemblies through the interaction of iso-tellurazole N-oxides with Lewis acids and bases

2017 ◽  
Vol 203 ◽  
pp. 187-199 ◽  
Author(s):  
Peter C. Ho ◽  
Hilary A. Jenkins ◽  
James F. Britten ◽  
Ignacio Vargas-Baca
Keyword(s):  
Electron Acceptor ◽  
Lewis Acids ◽  
Heterocyclic Carbenes ◽  
Supramolecular Assemblies ◽  
Triphenyl Phosphine ◽  
Tellurium Atom ◽  
Lewis Bases ◽  
Acids And Bases ◽  
Lewis Acids And Bases

The supramolecular macrocycles spontaneously assembled by iso-tellurazole N-oxides are stable towards Lewis bases as strong as N-heterocyclic carbenes (NHC) but readily react with Lewis acids such as BR3 (R = Ph, F). The electron acceptor ability of the tellurium atom is greatly enhanced in the resulting O-bonded adducts, which consequently enables binding to a variety of Lewis bases that includes acetonitrile, 4-dimethylaminopyridine, 4,4′-bipyridine, triphenyl phosphine, a N-heterocyclic carbene and a second molecule of iso-tellurazole N-oxide.

IgG responses to intranasal immunization with cholera-toxin-immobilized polymeric nanospheres in mice

2004 ◽  
Vol 15 (5) ◽  
pp. 661-669 ◽  
Author(s):  
Tatsuo Kaneko ◽  
Shogo Shimomai ◽  
Mutsumi Miyazaki ◽  
Masanori Baba ◽  
Mitsuru Akashi
Keyword(s):  
Cholera Toxin ◽  
Intranasal Immunization ◽  
Polymeric Nanospheres

Lewis-Base Adducts of Group 1B Metal(I) Compounds. XXI The Crystal and Molecular Structures of the Unsolvated Forms of Dibromotris(triphenylphosphine)dicopper(I) and 'step' Tetrabromotetrakis(triphenyl-phosphine)tetracopper(I)

1985 ◽  
Vol 38 (8) ◽  
pp. 1243 ◽  
Author(s):  
JC Dyason ◽  
LM Engelhardt ◽  
C Pakawatchai ◽  
PC Healy ◽  
AH White
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
Molecular Structures ◽  
Lewis Base ◽  
Crystal Data ◽  
X Ray Diffraction ◽  
Triphenyl Phosphine ◽  
X Ray ◽  
Crystal And Molecular Structures

The crystal structures of the title compounds have been determined by single-crystal X-ray diffraction methods at 295 K. Crystal data for (PPh3)2CuBr2Cu(PPh3) (1) show that the crystals are iso-morphous with the previously studied chloro analogue, being monoclinic, P21/c, a 19.390(8), b 9.912(5), c 26.979(9) Ǻ, β 112,33(3)°; R 0.043 for No 3444. Cu( trigonal )- P;Br respectively are 2.191(3); 2.409(2), 2.364(2) Ǻ. Cu(tetrahedral)- P;Br respectively are 2.241(3), 2.249(3); 2.550(2), 2.571(2) Ǻ. Crystals of 'step' [PPh3CuBr]4 (2) are isomorphous with the solvated bromo and unsolvated iodo analogues, being monoclinic, C2/c, a 25.687(10), b 16.084(7), c 17.815(9) Ǻ, β 110.92(3)°; R 0.072 for No 3055. Cu( trigonal )- P;Br respectively are 2.206(5); 2.371(3), 2.427(2) Ǻ. Cu(tetrahedral)- P;Br are 2.207(4); 2.446(2), 2.676(3), 2.515(3) Ǻ.

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