Local probe-induced structural isomerization in a one-dimensional molecular array.

Synthesis of one-dimensional molecular arrays with tailored stereoisomers is challenging yet has great potential for application in molecular opto-, electronic- and magnetic-devices, where the local array structure plays a decisive role in the functional properties. Here, we demonstrate the construction and characterization of dehydroazulene isomer and diradical units in three-dimensional organometallic compounds on Ag(111) with a combination of low-temperature scanning tunneling microscopy and density functional theory calculations. Tip-induced voltage pulses firstly result in the formation of a diradical species via successive homolytic fission of two C-Br bonds in the naphthyl groups, which are subsequently transformed into chiral dehydroazulene moieties.

Double-acceptor conjugated polymers for NIR-II fluorescence imaging and NIR-II photothermal therapy applications.

Single-component nanoplatforms combined with the second near-infrared optical window (NIR-II, 1000-1700 nm) fluorescence imaging (FI) and NIR-II photothermal therapy (PTT) have received increasing attention owing to their capacity for precise diagnosis, noninvasive therapy, and real-time monitoring of the therapeutic effects. However, most of the PTT treatments are performed in the NIR-I window (700-900 nm). Moreover, the design and development of conjugated polymers (P1, P2, and P3) with both bright NIR-II fluorescence and superior NIR-II photothermal effect remained a huge challenge.