Coordination Synergy between Iridium Photosensitizers and Metal Nanoclusters Leading to Enhanced CO Cycloaddition under Mild Conditions.

The achievement of photocatalytic CO and epoxide cycloaddition under mild conditions such as room temperature and atmospheric pressure is important for green chemistry, which can be achieved by developing coordination synergies between catalysts and photosensitizers. In this context, we exploit the use of coordinate bonds to connect pyridine-appended iridium photosensitizers and catalysts for CO cycloaddition, which is systematically demonstrated by H nuclear magnetic resonance titration and X-ray photoelectron spectroscopic measurements. It is shown that the hybrid Ir(Cltpy)/MnCd photocatalytic system with coordination synergy exhibits excellent catalytic performance (yield ≈ 98.

Novel salenCo(iii) photoinitiators and their application for cycloaddition of carbon dioxide.

Carbon dioxide (CO) is a renewable carbon resource that can be effectively used in the production of polycarbonate (PPC) and cyclic carbonate (CPC) through open-loop copolymerization with epoxides and CO. SalenCo(iii) can successfully break the carbon-oxygen link between propylene oxide (PO) and CO. On this basis, we prepared four different types of photosensitive salenCo(iii) complexes and investigated their catalytic copolymerization of CO and PO.

Novel Mn-Co nanocluster@photosensitizers/SalenCo(iii) catalyze the copolymerization of carbon dioxide and propylene oxide.

In general, transition metals (TMs) often facilitate highly efficient catalysis. Herein, we synthesized a series of nanocluster composite catalysts by combining with photosensitizers and SalenCo(iii) for the first time and studied the catalytic copolymerization of CO and propylene oxide (PO). Systematic experiments have shown that the selectivity of copolymerization products can be improved by the nanocluster composite catalysts, and their synergistic effects significantly improved the photocatalytic performance of carbon dioxide copolymerization.

MPA-CdTe quantum dots as "on-off-on" sensitive fluorescence probe to detect ascorbic acid via redox reaction.

Mercaptopropionic acid (MPA) capped CdTe quantum dots (MPA-CdTe QDs) were synthesized in aqueous medium by hydrothermal method, which modified by Fe could be used as a fluorescent probe to detect ascorbic acid (AA). MPA-CdTe QDs fluorescence probe could be used as successive sensor for metal ions and AA with "on-off-on" process. The fluorescence of QDs was quenched after adding Fe to MPA-CdTe QDs.

The salen based chemosensors for highly selective recognition of Zn ion.

Two novel salen based chemosensors have been successfully synthesized. UV-vis absorption, fluorescence emission spectroscopy and cyclic voltammetry (CV) were exploited to investigate their recognition toward various metal ions, including Na, K, Mg, Al, Zn, Ag, Pb, Co, Li, Ba, Ca, Cd, La, Cu and Mn ions. The results indicated that the sensor L1 and L2 exhibited highly selective and sensitive recognition for Zn ions.