FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W1967567972> ?p ?o ?g. }

• W1967567972 endingPage "255" @default.
• W1967567972 startingPage "241" @default.
• W1967567972 abstract "The nuclear magnetic shielding tensors of the protons in pyromellitic acid dianhydride were measured in single crystals by means of high resolution solid state multiple pulse N.M.R. techniques. In order to correlate the N.M.R. results to the molecules, the molecular and crystal structure of the compound was determined by direct X-ray methods. The molecules have approximately D 2h symmetry. There are Z = 4 molecules in the unit cell, they are all crystallographically equivalent and the two protons in each molecule are magnetically equivalent. The assignment of the measured proton shielding tensors to the various proton sites is based on linewidth differences in multiple pulse spectra which can be traced back to differences in dipolar interactions, and on local symmetry arguments. The least shielded direction of the protons is close to the normal of the aromatic ring, but the other two principal shielding directions do not conform to the D 2h symmetry of the molecule. The deviations are ascribed to intermolecular shielding contributions. These are calculated on the basis of a magnetic dipole model. The application of this model for assessing inter-molecular shielding contributions is discussed. The difference between the measured shielding tensor and the calculated intermolecular contribution conforms well to the D 2h symmetry of the molecule. We believe, therefore, that this difference can be identified with good accuracy with the proton shielding of an isolated pyromellitic acid dianhydride molecule. The results imply that the direction perpendicular to the bond within the molecular plane is the most shielded direction of the proton, whereas the bond direction itself is the inter-mediate principal shielding direction. It is believed that these features are characteristic for the shielding of aromatic protons in general." @default.
• W1967567972 created "2016-06-24" @default.
• W1967567972 creator A5005225730 @default.
• W1967567972 creator A5077140350 @default.
• W1967567972 creator A5088069999 @default.
• W1967567972 creator A5089790583 @default.
• W1967567972 date "1979-07-01" @default.
• W1967567972 modified "2023-10-17" @default.
• W1967567972 title "Pyromellitic acid dianhydride: crystal structure and anisotropic proton magnetic shielding" @default.
• W1967567972 cites W1618037286 @default.
• W1967567972 cites W1964435742 @default.
• W1967567972 cites W1977857873 @default.
• W1967567972 cites W1979993712 @default.
• W1967567972 cites W1983988803 @default.
• W1967567972 cites W1984442218 @default.
• W1967567972 cites W1993141804 @default.
• W1967567972 cites W2012130053 @default.
• W1967567972 cites W2018514105 @default.
• W1967567972 cites W2023081318 @default.
• W1967567972 cites W2039406135 @default.
• W1967567972 cites W2042819889 @default.
• W1967567972 cites W2057772423 @default.
• W1967567972 cites W2073674639 @default.
• W1967567972 cites W2078357472 @default.
• W1967567972 cites W2078374998 @default.
• W1967567972 cites W2092490157 @default.
• W1967567972 cites W2161187672 @default.
• W1967567972 cites W2210024210 @default.
• W1967567972 cites W2216731981 @default.
• W1967567972 cites W2315921408 @default.
• W1967567972 cites W2328164715 @default.
• W1967567972 cites W3004880868 @default.
• W1967567972 cites W3005101054 @default.
• W1967567972 cites W4241320995 @default.
• W1967567972 cites W4256030104 @default.
• W1967567972 doi "https://doi.org/10.1080/00268977900101631" @default.
• W1967567972 hasPublicationYear "1979" @default.
• W1967567972 type Work @default.
• W1967567972 sameAs 1967567972 @default.
• W1967567972 citedByCount "30" @default.
• W1967567972 countsByYear W19675679722016 @default.
• W1967567972 countsByYear W19675679722019 @default.
• W1967567972 crossrefType "journal-article" @default.
• W1967567972 hasAuthorship W1967567972A5005225730 @default.
• W1967567972 hasAuthorship W1967567972A5077140350 @default.
• W1967567972 hasAuthorship W1967567972A5088069999 @default.
• W1967567972 hasAuthorship W1967567972A5089790583 @default.
• W1967567972 hasConcept C120665830 @default.
• W1967567972 hasConcept C121332964 @default.
• W1967567972 hasConcept C159985019 @default.
• W1967567972 hasConcept C166950319 @default.
• W1967567972 hasConcept C173523689 @default.
• W1967567972 hasConcept C178790620 @default.
• W1967567972 hasConcept C185544564 @default.
• W1967567972 hasConcept C185592680 @default.
• W1967567972 hasConcept C192562407 @default.
• W1967567972 hasConcept C193547582 @default.
• W1967567972 hasConcept C2265751 @default.
• W1967567972 hasConcept C2524010 @default.
• W1967567972 hasConcept C2779886137 @default.
• W1967567972 hasConcept C32909587 @default.
• W1967567972 hasConcept C33923547 @default.
• W1967567972 hasConcept C41999313 @default.
• W1967567972 hasConcept C46141821 @default.
• W1967567972 hasConcept C54516573 @default.
• W1967567972 hasConcept C8010536 @default.
• W1967567972 hasConcept C85725439 @default.
• W1967567972 hasConceptScore W1967567972C120665830 @default.
• W1967567972 hasConceptScore W1967567972C121332964 @default.
• W1967567972 hasConceptScore W1967567972C159985019 @default.
• W1967567972 hasConceptScore W1967567972C166950319 @default.
• W1967567972 hasConceptScore W1967567972C173523689 @default.
• W1967567972 hasConceptScore W1967567972C178790620 @default.
• W1967567972 hasConceptScore W1967567972C185544564 @default.
• W1967567972 hasConceptScore W1967567972C185592680 @default.
• W1967567972 hasConceptScore W1967567972C192562407 @default.
• W1967567972 hasConceptScore W1967567972C193547582 @default.
• W1967567972 hasConceptScore W1967567972C2265751 @default.
• W1967567972 hasConceptScore W1967567972C2524010 @default.
• W1967567972 hasConceptScore W1967567972C2779886137 @default.
• W1967567972 hasConceptScore W1967567972C32909587 @default.
• W1967567972 hasConceptScore W1967567972C33923547 @default.
• W1967567972 hasConceptScore W1967567972C41999313 @default.
• W1967567972 hasConceptScore W1967567972C46141821 @default.
• W1967567972 hasConceptScore W1967567972C54516573 @default.
• W1967567972 hasConceptScore W1967567972C8010536 @default.
• W1967567972 hasConceptScore W1967567972C85725439 @default.
• W1967567972 hasIssue "1" @default.
• W1967567972 hasLocation W19675679721 @default.
• W1967567972 hasOpenAccess W1967567972 @default.
• W1967567972 hasPrimaryLocation W19675679721 @default.
• W1967567972 hasRelatedWork W1992194652 @default.
• W1967567972 hasRelatedWork W2058825745 @default.
• W1967567972 hasRelatedWork W2061552628 @default.
• W1967567972 hasRelatedWork W2086051331 @default.
• W1967567972 hasRelatedWork W2113194399 @default.
• W1967567972 hasRelatedWork W2121259494 @default.
• W1967567972 hasRelatedWork W2501154560 @default.

• next