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| Description
| - In the series of the methylated compounds (eta(5)-C5H5-nMen)TiCl3 (n=0-5) 1-6, linear correlations of lambda(max) of the absorption band and 3 Ti-49,Ti-47 chemical shift with the number of Me groups were found. It is due to the dependence of both the magnitudes on the HOMO-LUMO energy gap which is influenced by electron donating methyl substituents. The catalysts made by combining 1-6 with MAO (molar ratio Al/Ti 500) showed only a gross dependence of decreasing activity with the number of methyl groups. For compounds (eta(5)-C5Me4R)TiCl3 7-14 and (eta(5)-C5H(1,2,3-)Me3R)TiCl3 15-20 where R = alkyl, silyl or phenyl no correlation between lambda(max) and delta was found. Limited DFT calculations were performed to assign HOMO/LUMO orbitals involved. Crystal structures of 16 and 20 were determined and some other inspected to prove the absence of steric hindrance.
- In the series of the methylated compounds (eta(5)-C5H5-nMen)TiCl3 (n=0-5) 1-6, linear correlations of lambda(max) of the absorption band and 3 Ti-49,Ti-47 chemical shift with the number of Me groups were found. It is due to the dependence of both the magnitudes on the HOMO-LUMO energy gap which is influenced by electron donating methyl substituents. The catalysts made by combining 1-6 with MAO (molar ratio Al/Ti 500) showed only a gross dependence of decreasing activity with the number of methyl groups. For compounds (eta(5)-C5Me4R)TiCl3 7-14 and (eta(5)-C5H(1,2,3-)Me3R)TiCl3 15-20 where R = alkyl, silyl or phenyl no correlation between lambda(max) and delta was found. Limited DFT calculations were performed to assign HOMO/LUMO orbitals involved. Crystal structures of 16 and 20 were determined and some other inspected to prove the absence of steric hindrance. (en)
- V sérii methylovaných sločenin (.eta.5-C5H5-nMen)TiCl3 (n = 0-5) 1-6 byly nalezeny lineární závislosti hodnot .lambda.max absorpčního pásu a .delta. 49,47Ti chemického posunu na množství methylových skupin. Tato závislost je způsobena rozdílem energie HOMO-LUMO, jenž je ovlivněn elektron donačním efektem methylových substituentů. Katalyzátory připravené smícháním komplexů 1-6 s MAO (molární poměr Al/Ti 500) vykazují pouze hrubou závislost klesající aktivity na počtu methylových skupin. Pro sloučeniny (.eta.5-C5Me4R)TiCl3 7-14 a (.eta.5-C5H(1,2,3-)Me3R)TiCl3 15-20 kde R = alkyl, silyl nebo fenyl nebyla korelace mezi lambdamax a delta nalezena. Přiřazení HOMO/LUMO orbitalů bylo provedeno na základě DFT výpočtů. Krystalové struktury komplexů 16 a 20 potvrdily absenci sterického bránění. Slabá korelace spektroskopických vlastností s katalytickou aktivitou není překvapující neboť sterické efekty cyklopentadienylových ligandů na kationtovém polymerizačním centru jsou obecně předpokládané. (cs)
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| Title
| - Effects of substituents in cyclopentadienyltitanium trichlorides on electronic absorption and Ti-47,Ti-49 NMR spectra and styrene polymerization activated by methylalumoxane
- Effects of substituents in cyclopentadienyltitanium trichlorides on electronic absorption and Ti-47,Ti-49 NMR spectra and styrene polymerization activated by methylalumoxane (en)
- Efekt substituce cyklopentadienyltitan trichloridových komplexů na elektronovou absorpci, 47,49Ti NMR spektra a polymerizaci styrenu aktivovanou methylalumoxanem (cs)
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| skos:prefLabel
| - Effects of substituents in cyclopentadienyltitanium trichlorides on electronic absorption and Ti-47,Ti-49 NMR spectra and styrene polymerization activated by methylalumoxane
- Effects of substituents in cyclopentadienyltitanium trichlorides on electronic absorption and Ti-47,Ti-49 NMR spectra and styrene polymerization activated by methylalumoxane (en)
- Efekt substituce cyklopentadienyltitan trichloridových komplexů na elektronovou absorpci, 47,49Ti NMR spektra a polymerizaci styrenu aktivovanou methylalumoxanem (cs)
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| skos:notation
| - RIV/61388955:_____/06:00305707!RIV08-AV0-61388955
|
| http://linked.open.../vavai/riv/strany
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
| - P(FT-TA3/078), Z(AV0Z40400503)
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/61388955:_____/06:00305707
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| http://linked.open...riv/jazykVysledku
| |
| http://linked.open.../riv/klicovaSlova
| - titanium; half-sandwich titanocenes; substituent effects; electronic absorption spectra (en)
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| http://linked.open.../riv/klicoveSlovo
| |
| http://linked.open...odStatuVydavatele
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
| - Journal of Molecular Catalysis A: Chemical
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| http://linked.open...in/vavai/riv/obor
| |
| http://linked.open...ichTvurcuVysledku
| |
| http://linked.open...cetTvurcuVysledku
| |
| http://linked.open...vavai/riv/projekt
| |
| http://linked.open...UplatneniVysledku
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| http://linked.open...v/svazekPeriodika
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| http://linked.open...iv/tvurceVysledku
| - Mach, Karel
- Pinkas, Jiří
- Gyepes, R.
- Horáček, Michal
- Kubišta, Jiří
- Varga, V.
- Lyčka, A.
- Šindelář, P.
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| http://linked.open...n/vavai/riv/zamer
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| issn
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| number of pages
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