Matches in SemOpenAlex for { <https://semopenalex.org/work/W2316458032> ?p ?o ?g. }
Showing items 1 to 74 of
74
with 100 items per page.
- W2316458032 endingPage "344" @default.
- W2316458032 startingPage "336" @default.
- W2316458032 abstract "Abstract N-protonation of 5,10,15,20-tetraalkylporphyrins with n-butyl, isobutyl, isopropyl, 1-ethyl-propyl or tert-butyl substituents yields the respective 22,24-dihydroporphyrins (22H + ,24H + -porphyrindiium salts) that exhibit highly nonplanar conformations. Depending on the steric demand of the meso substituents, the free base porphyrins have planar to moderately ruffled macrocycles (primary or secondary alkyl residues) or are severely ruffled (tertiary alkyl residues). X-ray crystallographic studies show that protonation of porphyrins with n-Bu (2), i-Pr (3) or EtPr (4) substituents leads to steric congestion of the core resulting in symmetric, saddle distorted macrocycles as evidenced by average displacements of the Cb positions from the mean plane ranging from 0.79 to 1.01 Å. The structures observed for these porphyrin diacids are very similar in distortion mode and degree of nonplanarity to 5,10,15,20-tetraaryl-22H + ,24H + -porphyrindiium salts and to 2,3,7,8,12,13,17,18-octaalkyl-5,10,15,20-tetraaryl-porphyrins. In contrast, protonation of the highly ruffled 5,10,15,20-tetrakis(teA-r-butyl)porph-yrin results in a switch of the conformational distortion mode. The dication 6 shows both saddle distortion (C b displacements -1.3 Å) and ruffling of the macrocycle (C m displacements of approx. 0.48 Å). Thus, the need to accomodate four N-H units in the porphyrin core with its associated out-of-plane tilting of the pyrrole rings and the steric strain induced at the meso carbon atoms results in a highly nonplanar porphyrin with mixed distortion modes." @default.
- W2316458032 created "2016-06-24" @default.
- W2316458032 creator A5003317795 @default.
- W2316458032 date "2000-04-01" @default.
- W2316458032 modified "2023-09-30" @default.
- W2316458032 title "A Conformational Study of 5,10,15,20-Tetraalkyl-22H<sup>+</sup>,24H<sup>+</sup>-porphyrindiium Salts (Dication Salts)" @default.
- W2316458032 doi "https://doi.org/10.1515/znb-2000-3-417" @default.
- W2316458032 hasPublicationYear "2000" @default.
- W2316458032 type Work @default.
- W2316458032 sameAs 2316458032 @default.
- W2316458032 citedByCount "60" @default.
- W2316458032 countsByYear W23164580322012 @default.
- W2316458032 countsByYear W23164580322013 @default.
- W2316458032 countsByYear W23164580322014 @default.
- W2316458032 countsByYear W23164580322015 @default.
- W2316458032 countsByYear W23164580322016 @default.
- W2316458032 countsByYear W23164580322017 @default.
- W2316458032 countsByYear W23164580322018 @default.
- W2316458032 countsByYear W23164580322019 @default.
- W2316458032 countsByYear W23164580322020 @default.
- W2316458032 countsByYear W23164580322021 @default.
- W2316458032 countsByYear W23164580322022 @default.
- W2316458032 countsByYear W23164580322023 @default.
- W2316458032 crossrefType "journal-article" @default.
- W2316458032 hasAuthorship W2316458032A5003317795 @default.
- W2316458032 hasConcept C145148216 @default.
- W2316458032 hasConcept C155647269 @default.
- W2316458032 hasConcept C178790620 @default.
- W2316458032 hasConcept C185592680 @default.
- W2316458032 hasConcept C201194858 @default.
- W2316458032 hasConcept C2779400197 @default.
- W2316458032 hasConcept C2779480358 @default.
- W2316458032 hasConcept C2780263894 @default.
- W2316458032 hasConcept C30095370 @default.
- W2316458032 hasConcept C32909587 @default.
- W2316458032 hasConcept C66009135 @default.
- W2316458032 hasConcept C71240020 @default.
- W2316458032 hasConcept C75473681 @default.
- W2316458032 hasConcept C8010536 @default.
- W2316458032 hasConceptScore W2316458032C145148216 @default.
- W2316458032 hasConceptScore W2316458032C155647269 @default.
- W2316458032 hasConceptScore W2316458032C178790620 @default.
- W2316458032 hasConceptScore W2316458032C185592680 @default.
- W2316458032 hasConceptScore W2316458032C201194858 @default.
- W2316458032 hasConceptScore W2316458032C2779400197 @default.
- W2316458032 hasConceptScore W2316458032C2779480358 @default.
- W2316458032 hasConceptScore W2316458032C2780263894 @default.
- W2316458032 hasConceptScore W2316458032C30095370 @default.
- W2316458032 hasConceptScore W2316458032C32909587 @default.
- W2316458032 hasConceptScore W2316458032C66009135 @default.
- W2316458032 hasConceptScore W2316458032C71240020 @default.
- W2316458032 hasConceptScore W2316458032C75473681 @default.
- W2316458032 hasConceptScore W2316458032C8010536 @default.
- W2316458032 hasIssue "3-4" @default.
- W2316458032 hasLocation W23164580321 @default.
- W2316458032 hasOpenAccess W2316458032 @default.
- W2316458032 hasPrimaryLocation W23164580321 @default.
- W2316458032 hasRelatedWork W1976907880 @default.
- W2316458032 hasRelatedWork W1997288999 @default.
- W2316458032 hasRelatedWork W1999557930 @default.
- W2316458032 hasRelatedWork W2004548207 @default.
- W2316458032 hasRelatedWork W2028983762 @default.
- W2316458032 hasRelatedWork W2316458032 @default.
- W2316458032 hasRelatedWork W2386921485 @default.
- W2316458032 hasRelatedWork W2952118302 @default.
- W2316458032 hasRelatedWork W934243404 @default.
- W2316458032 hasRelatedWork W2463810949 @default.
- W2316458032 hasVolume "55" @default.
- W2316458032 isParatext "false" @default.
- W2316458032 isRetracted "false" @default.
- W2316458032 magId "2316458032" @default.
- W2316458032 workType "article" @default.