منابع مشابه
Carbon-13 Chemical-Shift Tensors in Polycyclic
The principal values of the 13C chemical-shift tensors of natural abundance biphenylene were measured at room temperature with the FIREMAT experiment. Of 18 crystallographically distinct positions (three sets of six congruent carbons each), the three primary bands have been resolved into seven single peaks and four degenerate peaks (two double, one triple, and one quadruple). Hence, eleven diff...
متن کاملElectron diffraction studies of supersonic jets . III . Clusters ofn - butane
Expansions of n -butane from small nozzles were observed to generate large clusters, provided that enough helium or neon carrier gas accompanied the butane to remove the heat of condensation rapidly and to produce low temperatures. Although expansions of neat n -butane led to substantial conformational cooling under some circumstances, clusters were never seen without carrier gas. Both thin-pla...
متن کاملMetathesis Activity Encoded in the Metallacyclobutane Carbon-13 NMR Chemical Shift Tensors
Metallacyclobutanes are an important class of organometallic intermediates, due to their role in olefin metathesis. They can have either planar or puckered rings associated with characteristic chemical and physical properties. Metathesis active metallacyclobutanes have short M-Cα/α' and M···Cβ distances, long Cα/α'-Cβ bond length, and isotropic 13C chemical shifts for both early d0 and late d4 ...
متن کاملCarbon-13 chemical shift anisotropy in DNA bases from field dependence of solution NMR relaxation rates.
Knowledge of (13)C chemical shift anisotropy (CSA) in nucleotide bases is important for the interpretation of solution-state NMR relaxation data in terms of local dynamic properties of DNA and RNA. Accurate knowledge of the CSA becomes particularly important at high magnetic fields, prerequisite for adequate spectral resolution in larger oligonucleotides. Measurement of (13)C relaxation rates o...
متن کاملTryptophan chemical shift in peptides and proteins: a solid state carbon-13 nuclear magnetic resonance spectroscopic and quantum chemical investigation.
We have obtained the carbon-13 nuclear magnetic resonance spectra of a series of tryptophan-containing peptides and model systems, together with their X-ray crystallographic structures, and used quantum chemical methods to predict the (13)C NMR shifts (or shieldings) of all nonprotonated aromatic carbons (C(gamma), C(delta 2) and C(epsilon 2). Overall, there is generally good accord between the...
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ژورنال
عنوان ژورنال: Bulletin of the Chemical Society of Japan
سال: 1973
ISSN: 0009-2673,1348-0634
DOI: 10.1246/bcsj.46.706