• iron;
  • magnetism;
  • NMR spectroscopy;
  • residual dipolar coupling;
  • structure elucidation

Semiconductor Nanocrystals

Recent progress in the synthesis of highly luminescent CdSe, CdS, ZnSe, and other AIIBVI core–shell colloidal quantum dots and the influence of the core structure and the core–shell interface on their luminescence quantum yield is reported in the Minireview by M. Artemyev, I. Nabiev, and P. Samokhvalov on page 1534 ff. Short- and long-term prospects for the development of techniques for producing fluorescent quantum dots for biological and technological applications are also discussed.

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A carbazole-based ratiometric fluorescent sensor has been developed. This sensor can be excited at λ=720 nm and can report mitochondrial viscosity over the range 1–950 cP within live cells and living tissues at a 60–130 μm depth by using highly reliable and accurate two-photon microscopy (TPM). See the Communication by J. Wang, X. Peng et al. on page 1548 ff. for more details.

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Supramolecular Chemistry

A strategy to endow a helical polymer chain with dynamic spring-like (contraction/expansion) motion through the 1D self-assembly (aggregation/disaggregation) of peripheral amphiphilic molecules is described in the Full Paper by M. Numata et al. on page 1592 ff. In the current system, a semi-artificial helical polysaccharide presenting peripheral amphiphilic chlorophyll units has been employed as a power device that undergoes contractive motion in aqueous media, driven by strong π–π interactions of its chlorophyll units or by cooperative molecular recognition of bipyridyl-type ligands through pairs of chlorophyll units, thereby converting molecular information into the regulated motion of a spring.

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