The electronic spectra and (hyper)polarizability of C₁₈–(CO)_n(n= 2, 4, and 6) are studied using theoretical calculations to reveal the effect of introducing carbonyl groups on the molecular optical properties.

Metal‐organic frameworks (MOFs) have attracted considerable attention as promising next‐generation active electrode materials for lithium‐ion batteries (LIBs) or sodium‐ion batteries (SIBs) because of ultrahigh specific surface area, uniformly distributed pores, and tunable structure. However, there are some disadvantages inevitably far from meeting commercial requirements, such as low conductivity, inconvenient electron transmission, and unsatisfactory circulation stability. In this review, a comprehensive summary of MOFs‐based electrode materials is presented and discussed. First, the general Li⁺/Na⁺ storage mechanism in MOFs‐based electrode materials, including conversion‐ and insertion‐type reactions, are summarized with details of active inorganic/organic ligands. Second, MOFs as anode materials for LIBs/SIBs are emphasized and improved on the electrochemical performances. Furthermore, very few research literature on MOFs‐based cathode materials is also discussed. Finally, opinions and prospects on the current challenge of MOFs‐based electrode materials are provided for future research directions.

Low-toxicity, highly luminescent, and water-soluble AgInS₂/ZnS nanocrystals (NCs) have been synthesized via a microwave-assisted approach. The structure and optical features of the AgInS₂/ZnS NCs were characterized by X-ray diffraction, high resolution transmission electron microscopy, Fourier transform infrared spectroscopy, ultraviolet visible absorption spectroscopy and photoluminescence (PL) spectroscopy. The as-synthesized AgInS₂/ZnS NCs exhibited high PL quantum yields (40%) and long PL lifetimes (424.5 ns). Furthermore, the dynamic changes of the intracellular copper(II) levels in HeLa cells were monitored using the AgInS₂/ZnS NCs as fluorescent probes. The results showed that the AgInS₂/ZnS NCs as promising fluorescent probes can be used in the detection of intracellular copper ions in living cells.

Monitoring drug release in vitro and in vivo is of paramount importance to accurately locate diseased tissues, avoid inappropriate drug dosage, and improve therapeutic efficiency. In this regard, it is promising to develop strategies for real‐time monitoring of drug release inside targeted cells or even in living bodies. Thus far, many multi‐functional drug delivery systems constructed by a variety of building blocks, such as organic molecules, polymeric nanoparticles, micelles, and inorganic nanoparticles, have been developed for drug release monitoring. Especially, with the advancements in imaging modalities relating to nanomaterials, there has been an increasing focus on the use of non‐invasive imaging techniques for monitoring drug release and drug efficacy in recent years. In this review, we introduce the application of fluorescence imaging, magnetic resonance imaging (MRI), surface‐enhanced Raman scattering (SERS), and multi‐mode imaging in monitoring drug release, involving a variety of nanomaterials such as organic or inorganic nanoparticles as imaging agents; their design principles are also elaborated. Among these, a special emphasis is placed on fluorescence‐based drug release monitoring strategies, followed by a brief overview of MRI, SERS, and multi‐mode imaging‐based strategies. In the end, the challenges and prospects of drug release monitoring are also discussed.