- Synthesis of sulfur-rich polymers: Copolymerization of cyclohexene sulfide and carbon disulfide using chromium complexes
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An investigation of the copolymerization of cyclohexene sulfide and carbon disulfide using salphen and salen Cr complexes as catalysts and [PPN]+X- salts as cocatalysts, at different temperatures and reaction times, is reported. Both
- Silvano, Selena,Carrozza, Chiara Francesca,de Angelis, Alberto Renato,Tritto, Incoronata,Boggioni, Laura,Losio, Simona
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- Kinetic Studies of Copolymerization of Cyclohexene Oxide with CO2 by a Diamino-bis(phenolate) Chromium(III) Complex
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A diamino-bis(phenolate) chromium(III) complex, CrCl(THF)[L], 1, where [L] = dimethylaminoethylamino-N,N-bis(2-methylene-4,6-tert-butylphenolate), has been synthesized in high yield and characterized by MALDI-TOF mass spectrometry, elemental analysis, UV-
- Ni, Kaijie,Kozak, Christopher M.
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- Kinetic studies of the alternating copolymerization of cyclic acid anhydrides and epoxides, and the terpolymerization of cyclic acid anhydrides, epoxides, and CO2 catalyzed by (salen)CrIIICl
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Copolymerization of a series of cyclic acid anhydrides with several epoxides using (salen)CrCl/onium salt catalysts has afforded polyesters with high molecular weights and narrow molecular weight distributions. The (salen)CrCl catalyst in the presence of
- Darensbourg, Donald J.,Poland, Ross R.,Escobedo, Christina
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- Pseudohalide HCN aggregate ions: [N3(HCN)3]?, [OCN(HCN)3]?, [SCN(HCN)2]?and [P(CN·HCN)2]?
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In the presence of μ-nitridobis(triphenylphosphonium) cation, [PPN]+, it was possible to stabilize and isolate [PPN]+-salts bearing the highly labile hydrogen cyanide aggregate anions of pseudohalides X (X = N3, OCN and SC
- Harloff, J?rg,Schulz, Axel,Stoer, Philip,Villinger, Alexander
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supporting information
p. 13345 - 13351
(2020/10/13)
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- Binary polyazides of cadmium and mercury
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Following our interest in binary element-nitrogen compounds we report here on the synthesis and comprehensive characterization (M.p., IR/Raman, elemental analysis, 14N/133Cd/199Hg NMR) of tri-and tetraazido cadmate and mercurate anions [E(N3)(2+n)]n- (E = Cd, Hg; n = 1, 2) in a series of [Ph4P]+ and [PNP]+ ([PNP]+ = bis(triphenylphosphine)-iminium) salts. The azide/chloride exchange in CH2Cl2 as well as the formation of tetrazolate salts in CH3CN solutions of the polyazido mercurates were investigated. Single crystal X-ray structures of all new compounds, and for comparison [Ph4P][Cd2(N3)5(H2O)], were determined. Moreover, the synthesis of anhydrous cadmium(II) azide and its DMSO adduct is presented for the first time. For a better understanding of structure and bonding in E(N3)2, [E(N3)3]- and [E(N3)4]2-, theoretical calculations at the M06-2X/aug-cc-pVDZ level were carried out.
- Schulz, Axel,Villinger, Alexander
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supporting information
p. 3649 - 3663
(2015/03/04)
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- Regarding Initial Ring Opening of Propylene Oxide in its Copolymerization with CO2 Catalyzed by a Cobalt(III) Porphyrin Complex
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Cobalt(III) tetraphenylporphyrin chloride (TPPCoCl) was experimentally proved to be an active catalyst for poly(propylene carbonate) production. It was chosen as a model catalyst in the present work to investigate the initiation step of propylene oxide (PO)/CO2 copolymerization, which is supposed to be the ring opening of the epoxide. Ring-opening intermediates (1-7) were detected by using 1HNMR spectroscopy. A first-order reaction in TPPCoCl was determined. A combination of monometallic and bimetallic ring-opening pathways is proposed according to kinetics experiments. Addition of onium salts (e.g., bis(triphenylphosphine)iminium chloride, PPNCl) efficiently promoted the PO ring-opening rate. The existence of axial ligand exchange in the cobalt porphyrin complex in the presence of onium salts was suggested by analyzing collected 1HNMR spectra. Monometallic or bimetallic? Ring-opening intermediates of propylene oxide (PO) catalyzed by a cobalt(III) porphyrin complex were identified by using 1HNMR spectroscopy. The generated metal alkoxides underwent hydrolysis in the presence of trace amounts of water. A combined bimetallic and monometallic ring-opening pathway was suggested from the kinetics results. Addition of onium salts accelerated the PO ring opening. Ligand exchange on the cobalt center in the presence of onium salts was also detected.
- Xia, Wei,Vagin, Sergei I.,Rieger, Bernhard
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supporting information
p. 15499 - 15504
(2016/02/18)
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- Neutral lewis base adducts of silicon tetraazide
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Highly energetic and still stable: The first base adducts of silicon tetraazide, Si(N3)4(L2) (L2= bipyridine, 1,10-phenanthroline), were prepared and fully characterized (picture: the ball and stick model of the
- Portius, Peter,Filippou, Alexander C.,Schnakenburg, Gregor,Davis, Martin,Wehrstedt, Klaus-Dieter
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supporting information; experimental part
p. 8013 - 8016
(2011/01/09)
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