Some studies in inorganic complexes. IV. Titanium(III) and Titanium(IV)

1959 ◽  
Vol 12 (2) ◽  
pp. 122 ◽  
Author(s):  
GJ Sutton
Keyword(s):  
Molecular Weight ◽  
Conductivity Measurements ◽  
Titanium Complexes ◽  
Inorganic Complexes

The titanium complexes TiCl3.D.H2O, TiBr3.D.H2O, TiCl4.D, and TiBr4.D, In which D is o-phenylenebisdimethylarsine. have been prepared and studied. By means of conductivity and molecular weight measurements, it has been shown that they are 6-covalent non-electrolytes. The thiocyanato complexes [NH4][Ti(SCN)4(H2O)2,], [NH4][Ti(SCN)4], and [NH4][Ti(SCN)4OH.H2O] were also prepared and their structures verified by conductivity measurements.

scholarly journals Methylene-Bridged Tridentate Salicylaldiminato Binuclear Titanium Complexes as Copolymerization Catalysts for the Preparation of LLDPE through [Fe]/[Ti] Tandem Catalysis

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1114 ◽  
Author(s):  
Yani Luo ◽  
Jian Li ◽  
Derong Luo ◽  
Qingliang You ◽  
Zifeng Yang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Temperature ◽  
Gel Permeation Chromatography ◽  
13C Nmr Spectroscopy ◽  
Molar Ratio ◽  
Tandem Catalysis ◽  
Titanium Complexes ◽  
Scanning Calorimetry ◽  
Molecular Weights ◽  
Branching Degree

A novel tandem catalysis system consisted of salicylaldiminato binuclear/mononuclear titanium and 2,6-bis(imino)pyridyl iron complexes was developed to catalyze ethylene in-situ copolymerization. Linear low-density polyethylene (LLDPE) with varying molecular weight and branching degree was successfully prepared with ethylene as the sole monomer feed. The polymerization conditions, including the reaction temperature, the Fi/Ti molar ratio, and the structures of bi- or mononuclear Ti complexes were found to greatly influence the catalytic performances and the properties of obtained polymers. The polymers were characterized by differential scanning calorimetry (DSC), high temperature gel permeation chromatography (GPC) and high temperature 13C NMR spectroscopy, and found to contain ethyl, butyl, as well as some longer branches. The binuclear titanium complexes demonstrated excellent catalytic activity (up to 8.95 × 106 g/molTi·h·atm) and showed a strong positive comonomer effect when combined with the bisiminopyridyl Fe complex. The branching degree can be tuned from 2.53 to 22.89/1000C by changing the reaction conditions or using different copolymerization pre-catalysts. The melting points, crystallinity and molecular weights of the products can also be modified accordingly. The binuclear complex Ti2L1 with methylthio sidearm showed higher capability for comonomer incorporation and produced polymers with higher branching degree and much higher molecular weight compared with the mononuclear analogue.

ABSORPTION SPECTRA AND CONFIGURATION OF SOME AMINE COMPLEXES OF COPPER (II) ACETATE

1966 ◽  
Vol 44 (8) ◽  
pp. 895-898 ◽  
Author(s):  
Gopal Narain
Keyword(s):  
Molecular Weight ◽  
Absorption Spectra ◽  
Coordination Complexes ◽  
Single Band ◽  
Aliphatic Amines ◽  
Conductivity Measurements ◽  
Visible Absorption ◽  
Amine Complexes ◽  
Constituent Elements ◽  
Absorption Measurements

Coordination complexes of copper(II) acetate, ammonia, aliphatic amines, and pyridine have been prepared. Molecular formulae on the basis of percentage of constituent elements were found to be Cu(OAc)2(am)2, where OAc represents acetate ion and am any amine used. Conductivity measurements in nitrobenzene and formamide indicate that the complexes are nonelectrolytes and thus it is suggested that acetate ions are also coordinated. Molecular weight measurements in the same solvents confirm this. Visible absorption measurements in formamide show a single band at about 635 mμ.

Reactions of Sodium N,N-Diethyldithiocarbamate with the Chlorides and Bromides of Niobium(V), Tantalum(V), and Protactinium(V)

1971 ◽  
Vol 49 (8) ◽  
pp. 1151-1160 ◽  
Author(s):  
P. R. Heckley ◽  
D. G. Holah ◽  
D. Brown
Keyword(s):  
Electrical Conductivity ◽  
Molecular Weight ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Organic Solvents ◽  
Conductivity Measurements ◽  
Nuclear Magnetic

Reactions between niobium(V), tantalum(V), and protactinium(V) chlorides and bromides and sodium N,N-diethyldithiocarbamate (Nadtc) have been examined in non-aqueous, non-oxygenated organic solvents. Complexes obtained are of the types Mdtc4X, Mdtc3X2, Mdtc3S, Mdtc2X3, and Mdtc2X3.nC6H6 (n = 0.7–1.0); not all complexes have been isolated for each metal. Within each group the niobium(V) and tantalum(V) complexes are isostructural; possible structures are discussed in the light of results from infrared (i.r.) and nuclear magnetic resonance (n.m.r.) spectra, molecular weight, and electrical conductivity measurements.

Asymmetric bis-salicylaldiminato binuclear titanium complexes for ethylene polymerization and copolymerization

2021 ◽  
Author(s):  
Yawen Qin ◽  
Tingcheng Li ◽  
Xiong Chen ◽  
Jian Li ◽  
Xiang Meng ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Ethylene Polymerization ◽  
Titanium Complexes ◽  
Broad Molecular Weight Distribution

Polyolefins with high molecular weight and broad molecular weight distribution have attracted great attention due to their ease of processing and wide applications. In this paper, methylene-bridged asymmetric disalicylaldimine ligands...

Fluorinated bis(phenoxy-imine)titanium complexes with methylaluminoxane for the synthesis of ultra high molecular weight polyethylene

Polymer ◽  
2013 ◽  
Vol 54 (13) ◽  
pp. 3217-3222 ◽  
Author(s):  
Supaporn Khaubunsongserm ◽  
Pimpa Hormnirun ◽  
Tanin Nanok ◽  
Bunjerd Jongsomjit ◽  
Piyasan Praserthdam
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Titanium Complexes ◽  
Ultra High Molecular Weight

Heterocycle-Fused Indenyl Silyl Amido Dimethyl Titanium Complexes as Catalysts for High Molecular Weight Syndiotactic Amorphous Polypropylene

2004 ◽  
Vol 23 (3) ◽  
pp. 344-360 ◽  
Author(s):  
Cristiano Grandini ◽  
Isabella Camurati ◽  
Simona Guidotti ◽  
Nicoletta Mascellani ◽  
Luigi Resconi ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Titanium Complexes

Substituent Effects on Silicon of Bridged Tetramethylcyclopentadienyl−Phenoxy Titanium Complexes for Controlling the Regiochemistry and Molecular Weight in 1-Olefin Polymerization

2009 ◽  
Vol 42 (21) ◽  
pp. 8006-8009 ◽  
Author(s):  
Taichi Senda ◽  
Hidenori Hanaoka ◽  
Takahiro Hino ◽  
Yoshiaki Oda ◽  
Hayato Tsurugi ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Olefin Polymerization ◽  
Substituent Effects ◽  
Titanium Complexes

Living syndiospecific polymerization of propylene with sterically encumbered titanium complexes activated by MMAO

2014 ◽  
Vol 5 (22) ◽  
pp. 6510-6522 ◽  
Author(s):  
Ying-Yun Long ◽  
Yong-Xia Wang ◽  
Bai-Xiang Li ◽  
Yan-Guo Li ◽  
Yue-Sheng Li
Keyword(s):  
Molecular Weight ◽  
Living Polymerization ◽  
Bulky Substituent ◽  
Titanium Complexes ◽  
Titanium Complex ◽  
Molecular Weights ◽  
Molecular Weight Distributions ◽  
Weight Distributions

On activation with MMAO, the newly designed titanium complex with bulky substituent promotes living polymerization of propylene, affording highly syndiotactic (rrrr 98.0%) polymers with high molecular weights and narrow molecular weight distributions (Mw/Mn ≤ 1.26).

Some Studies in Inorganic Complexes. V. Mercury(II)

1959 ◽  
Vol 12 (4) ◽  
pp. 637 ◽  
Author(s):  
GJ Sutton
Keyword(s):  
Molecular Weight ◽  
Absorption Spectra ◽  
Ultra Violet ◽  
Inorganic Complexes

A study has been made of mercury(II) complexes of ethylenediamine, 1,10-phenanthroline, and 2,2'-dipyridyl. By means of conductance and molecular weight measurements it has been shown that complexes of the type HgX2.B and HgY.B, in which B is the base, X is halogen or nitrite, and Y is oxalate or sulphate, are 4-covalent non-electrolytes. The absorption spectra of the halogen complexes in the near ultra-violet range are characteristic of the chelate with a shift of absorption to longer wavelengths. Bisphenanthroline and bisdipyridyl complexes of mercury(II) were also investigated.

Ligand Migration in the Reaction of Titanium Complexes with AlMe3

2007 ◽  
Vol 72 (4) ◽  
pp. 541-559 ◽  
Author(s):  
Michał J. Kobyłka ◽  
Lucjan B. Jerzykiewicz ◽  
Jasson T. Patton ◽  
Szymon Przybylak ◽  
Józef Utko ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Catalytic Performance ◽  
Active Species ◽  
Titanium Complexes ◽  
Propene Polymerization ◽  
Ligand Migration ◽  
High Yields ◽  
Titanium Compounds ◽  
Insight Into ◽  
Gaining Insight

Five different titanium compounds cis-[Ti(η2-hbo)2(OEt)2]·0.5toluene (1), cis-[TiCl2(η2-thp)2] (2), [TiCl2(edbp)2] (3), [Ti2(μ-OMe)2(edbp)2(Me)2] (6), [Ti2(μ-OMe)2(edbp)2(OMe)2] (7) (Hhbo = 2-(2-hydroxyfenyl)benzoxazole, Hthp = tetrahydropyran-2-methanol, H2edbp = 2,2'-ethylidenebis(4,6-di-tert-butylphenol)), have been prepared and tested in combination with MAO as catalysts for propene polymerization and ethene and oct-1-ene copolymerization with the aim of gaining insight into the structure of the active species. Investigation of the 1/AlMe3 or 2/AlMe3 systems resulted in isolation of [Al(η2-hbo)2(Me)] (4) and [Al2(μ2-η2-thp)2(Me)4] (5) in high yields. This indicates that the trimethylaluminum contained in MAO abstracts ligands from 1 or 2, affecting thus the catalytic performance of the 1,2/MAO catalysts. In contrast, compound 3 reacted with MAO affording methylated product 6. Accordingly, the 3/MAO catalyst differed from the above ones, furnishing at 70 °C e.g., narrow molecular weight polypropylene (Mn = 454 000; Mw/Mn = 2.49; Tm = 158.2 °C).

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