Matches in SemOpenAlex for { <https://semopenalex.org/work/W1997989250> ?p ?o ?g. }
Showing items 1 to 87 of
87
with 100 items per page.
- W1997989250 endingPage "15" @default.
- W1997989250 startingPage "9" @default.
- W1997989250 abstract "Abstract The aquation of carbonatotetraaminecobalt(III) ions; [Co(N 2 ) 2 CO 3 ] + where (N 2 ) is 1,1,2,2-tetramethylethylenediamine (tme) and N,N′ -dimethylethylenediamine (bmen) has been studied in aqueous 1.0 M HClO 4 /NaClO 4 . For tme, the HClO 4 is 0.01-0.20 M and the temperature is 20, 25, 30 and 35 °C; for bmen, the HClO 4 is 0.15-0.55 M and the temperature is 55 and 63 °C. Both complexes hydrolyse to form the cis -diaqua product, and the rate law is d(ln[complex])/d t = k o + k 1 [H 3 O + ]. The values of the rate constant (25 °C), Δ H ≠ (kcal mol −1 ) and ΔS ≠ (cal mol −1 K −1 ) are: for [Co(tme) 2 CO 3 ] + , k o =2.59×10 −4 s −1 , Δ H o ≠ =18.6±1.8, ΔS o ≠ =−12.6±8.5; k 1 =2.86×10 −2 M −1 s −1 , ΔH 1 ≠ =ll.4±1.0, ΔS 1 ≠ =−27.5±3.4; for [Co(bmen) 2 CO 3 ] + , k o =1.33×10 −6 s −1 , ΔH o ≠ =4.6, ΔS o ≠ = −66; k 1 =5.54× 10 −6 M −1 s −1 , ΔH 1 ≠ =28.3, ΔS 1 ≠ =12.2. The tme system shows a deuterium isotope effect with k 1 D / k 1 H =2.2, consistent with a rapid pre-equilibrium protonation followed by rate controlling ring opening. The variations of k 1 with the amine ligand are in the order (en) 2 ⋍(pn) 2 >(tme) 2 ⪢(bmen) 2 . Since the latter two systems have almost the same electron donor ability, based on their pK a values, their large reactivity difference must be ascribed to steric effects of the −N(CH 3 ) groups in bmen. The data from a large number of previous studies of such carbonate chelate ring openings have been reanalysed, and the reactivity patterns are discussed." @default.
- W1997989250 created "2016-06-24" @default.
- W1997989250 creator A5088588759 @default.
- W1997989250 creator A5089444540 @default.
- W1997989250 date "1994-06-01" @default.
- W1997989250 modified "2023-09-23" @default.
- W1997989250 title "The steric effect on the ring opening process of the decarboxylation of cis-carbonato-bis(diamine)cobalt(III) ions" @default.
- W1997989250 cites W1973703343 @default.
- W1997989250 cites W1978799489 @default.
- W1997989250 cites W1983907218 @default.
- W1997989250 cites W2003665393 @default.
- W1997989250 cites W2008695787 @default.
- W1997989250 cites W2008899140 @default.
- W1997989250 cites W2012040592 @default.
- W1997989250 cites W2016065841 @default.
- W1997989250 cites W2022792503 @default.
- W1997989250 cites W2031486596 @default.
- W1997989250 cites W2031984041 @default.
- W1997989250 cites W2034715289 @default.
- W1997989250 cites W2042285518 @default.
- W1997989250 cites W2043198291 @default.
- W1997989250 cites W2052158796 @default.
- W1997989250 cites W2089660509 @default.
- W1997989250 cites W2091734467 @default.
- W1997989250 cites W2318834733 @default.
- W1997989250 cites W2318943338 @default.
- W1997989250 cites W2320276988 @default.
- W1997989250 cites W2320502917 @default.
- W1997989250 cites W3135993535 @default.
- W1997989250 cites W3137487843 @default.
- W1997989250 cites W3137782958 @default.
- W1997989250 cites W3139352032 @default.
- W1997989250 doi "https://doi.org/10.1016/0020-1693(94)03957-7" @default.
- W1997989250 hasPublicationYear "1994" @default.
- W1997989250 type Work @default.
- W1997989250 sameAs 1997989250 @default.
- W1997989250 citedByCount "7" @default.
- W1997989250 crossrefType "journal-article" @default.
- W1997989250 hasAuthorship W1997989250A5088588759 @default.
- W1997989250 hasAuthorship W1997989250A5089444540 @default.
- W1997989250 hasConcept C145148216 @default.
- W1997989250 hasConcept C155647269 @default.
- W1997989250 hasConcept C161790260 @default.
- W1997989250 hasConcept C178790620 @default.
- W1997989250 hasConcept C179104552 @default.
- W1997989250 hasConcept C185592680 @default.
- W1997989250 hasConcept C188027245 @default.
- W1997989250 hasConcept C201194858 @default.
- W1997989250 hasConcept C2780378348 @default.
- W1997989250 hasConcept C2780595602 @default.
- W1997989250 hasConcept C2780871995 @default.
- W1997989250 hasConcept C515602321 @default.
- W1997989250 hasConcept C71240020 @default.
- W1997989250 hasConceptScore W1997989250C145148216 @default.
- W1997989250 hasConceptScore W1997989250C155647269 @default.
- W1997989250 hasConceptScore W1997989250C161790260 @default.
- W1997989250 hasConceptScore W1997989250C178790620 @default.
- W1997989250 hasConceptScore W1997989250C179104552 @default.
- W1997989250 hasConceptScore W1997989250C185592680 @default.
- W1997989250 hasConceptScore W1997989250C188027245 @default.
- W1997989250 hasConceptScore W1997989250C201194858 @default.
- W1997989250 hasConceptScore W1997989250C2780378348 @default.
- W1997989250 hasConceptScore W1997989250C2780595602 @default.
- W1997989250 hasConceptScore W1997989250C2780871995 @default.
- W1997989250 hasConceptScore W1997989250C515602321 @default.
- W1997989250 hasConceptScore W1997989250C71240020 @default.
- W1997989250 hasIssue "1-2" @default.
- W1997989250 hasLocation W19979892501 @default.
- W1997989250 hasOpenAccess W1997989250 @default.
- W1997989250 hasPrimaryLocation W19979892501 @default.
- W1997989250 hasRelatedWork W2013117887 @default.
- W1997989250 hasRelatedWork W2014789700 @default.
- W1997989250 hasRelatedWork W2036063461 @default.
- W1997989250 hasRelatedWork W2042812900 @default.
- W1997989250 hasRelatedWork W2063472119 @default.
- W1997989250 hasRelatedWork W2106718214 @default.
- W1997989250 hasRelatedWork W2949225623 @default.
- W1997989250 hasRelatedWork W3015795223 @default.
- W1997989250 hasRelatedWork W3034897343 @default.
- W1997989250 hasRelatedWork W3083129537 @default.
- W1997989250 hasVolume "221" @default.
- W1997989250 isParatext "false" @default.
- W1997989250 isRetracted "false" @default.
- W1997989250 magId "1997989250" @default.
- W1997989250 workType "article" @default.