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It is demonstrated that chirality of molecules composed of 1,2,4,5‐benzenetetracarboxydiimide (pyromellitic diimide) or 1,4,5,8‐naphthalenetetracarboxydiimide units is reflected by their exciton Cotton effects. The analysis is based on the calculated (ZINDO/S) excited states of the model diimide chromophores 1a and 2a. Rotation of the diimide chromophores around the C‐N bond in diimides 3–5 is evaluated from the dynamic 1H NMR data. A comparison of chiroptical properties of bis‐diimides 3–5 with the CD spectra of bis‐imides 6–8 is also presented. Chirality 12:263–268, 2000. © 2000 Wiley‐Liss, Inc.

An efficient one-pot method for the preparation of 1,2,3triazoles by 1,3-dipolar cycloaddition of in situ generated azides and alkynes is presented. This facile method can be applied to benzyl or alkyl halides and pure products are isolated by simple filtration.

Using non-denaturing isoelectric focusing in polyacrylamide vertical slab gel, we have purified to homogeneity three trimeric subcomplexes of LHC II from Arabidopsis thylakoid membranes. The polypeptide composition of the subcomplexes were studied by immunoblotting. Our results indicate the existence in vivo of LHC II heterotrimers containing Lhcb1, Lhcb2 and Lhcb3 gene products.