We review recent NMR studies of the layered organic superconductors of the (BEDT)2X family. First the normal state properties are discussed. The central issue is the importance of the interplay between antiferromagnetism and superconductivity in these materiais demonstrated by the observation of a pseudogap developing prior to the superconducting transition. An extended analysis of the Knight s...

A complex mixture of fluoro-polyphosphates (FPPs) and polyphosphates was prepared by heating a mixture of NaF and sodium tripolyphosphate (STPP) at 600 8C in nitrogen atmosphere. Two-dimensional P–F heteronuclear correlation spectroscopy (HETCOR) NMR was developed in identifying the atomic connection between F and P in the mixed FPPs. F, P and P–P correlation spectroscopy (COSY) NMR methods wer...

2H Magic-angle spinning nuclear magnetic resonance (MAS NMR), echo 27Al NMR, two-dimensional (2D) echo 1H MAS NMR and 1H, 27Al and 29Si MAS NMR have been applied to study the acid sites of dehydrated zeolites. The quadrupole coupling constants CQCC determined from 2H MAS NMR spectra of Si-OH-Al sites increase with the framework aluminium content of the zeolites from 208 Hz (H-ZSM-5) to 236 kHz ...

SUMMARY ADAPT-nuclear magnetic resonance (ADAPT-NMR) offers an automated approach to the concurrent acquisition and processing of protein NMR data with the goal of complete backbone and side chain assignments. What the approach lacks is a useful graphical interface for reviewing results and for searching for missing peaks that may have prevented assignments or led to incorrect assignments. Beca...

Z. Naturforsch. 54 b, 57-62 (1999); received July 28, 1998 Ferrocene, Tin, Phosphorus, NMR Data, Coupling Signs l,l,3,3-Tetramethyl-2-organo(R)-l,3-distanna-2-phospha-[3]ferrocenophanes [R = Me (2a), rBu (2b), CöH i i (2c), Ph (2d)] and one arsa-analogue 2d(As) were obtained from the reaction of l,l'-bis(chlorodimethylstannyl)ferrocene 1 with either bis(trimethylsilyl)methylphosphane or the dil...

Peptidic foldamers have recently emerged as a novel class of artificial oligomers with properties and structural diversity similar to that of natural peptides, but possessing additional interesting features granting them great potential for applications in fields from nanotechnology to pharmaceuticals. Among these, foldamers containing 1,4- and 1,5-substitued triazole amino acids are easily pre...

A known ent-kaurane diterpenoid, ent-19-al-17,16β-dihydroxykaurane (1), together with the new one, ent-3β, 16β, 19-trihydroxykaurane (2), called leptophyllin, were isolated from aerial parts of Baccharis leptophylla. Their structures were established on the basis of NMR spectroscopic analysis. Based on this study the H and C NMR spectral data of compound (1) were completed by means of 2D NMR te...

A new cyclohexenone compound was isolated as a mixture of enantiomers from a culture filtrate of Lasiodiplodia theobromae. The relative structure was determined to be 4,5-dihydroxy-3-methyl-cyclohex-2-enone on the basis of MS, (1)H-NMR, and (13)C-NMR spectroscopic analyses, including 2D-NMR experiments. Resolution of the enantiomers was conducted by a coupling reaction with (S)-MTPA-Cl followed...

The H and C chemical shifts of flavone and its five derivatives were determined completely using the basic 1D and 2D NMR experiments and molecular modeling. Of the six compounds used for our experiments, the NMR data of three compounds were published previously, but we found that the data of two compounds included wrong assignments. Therefore, we report the corrected data and the complete assig...

A novel triterpenoid, holophyllane A (1), featuring a B-nor-3,4-seco-17,14-friedo-lanostane, along with its putative precursor, compound 2 were isolated from the methanol extract of the trunks of Abies holophylla. The 2D structure and relative configuration of 1 were initially determined via analysis of 1D and 2D NMR spectroscopic data and the assignment was confirmed by quantum mechanics-based...