Two remarkable polyoxometalate-bridged Cu(I)-and Ag(I)thiacalix[4]arene dimers, namely, [Cu 4 (SiW 12 O 40 )(L) 2 (DMF) 2 ]•2EtOH•DMF (1-Cu) and [Ag 4 (PMo 12 O 40 )(L) 2 ]•OH (1-Ag), were prepared by using a new thiacalix[4]arene, metal cation and polyoxometalate (L = tetra[2-(ethylthio)-1methyl-1H-imidazole]-thiacalix[4]arene). In 1-Cu and 1-Ag, two thiacalix[4]arenes were linked together by one [SiW 12 O 40 ] 4− or [PMo 12O 40 ] 3− anion via two metal cations to give a molecular dimer. Further, adjacent dimers were extended into a high-dimensional supramolecular architecture through hydrogen bonds. Markedly, these molecular dimers are exceedingly stable in organic solvents and then were employed as efficient catalysts for catalytic oxidation desulfurization as well as the azide−alkyne "click" reaction.

Light-responsive metal−organic frameworks (LMOFs) are intriguing materials for CO 2 capture owing to their tunable structures and performances. However, conventional LMOFs are reported to regulate CO 2 adsorption capacity by steric hindrance or structural variation because of the weak affinity between the adsorbate and adsorbent. Developing efficient LMOF-based adsorbents with strong but tunable active sites for controllable CO 2 capture is an extremely desirable yet challenging task. In this work, we constructed an LMOF-based adsorbent with targeted adsorption sites by incorporating polyethyleneimine into an azobenzene-decorated LMOF for controllable CO 2 capture. The targeted active sites of amines endow the adsorbent with enhanced selectivity in the capture of CO 2 . Additionally, the surface electrostatic potential around amines can be regulated by the isomerization of azobenzene moieties upon light irradiation. Moreover, the reversible light irradiation generates the adsorbents with exposed/sheltered adsorption sites for the controllable capture of CO 2 on amines. The present work encourages us to develop novel LMOF-based adsorbents for controllable adsorption separation, which is hard to realize by conventional LMOFs.

Public diplomatic decisions are one of the main themes of the American think tanks, they are committed to the sustainable development research of the national policy and they utilize the media in a variety of ways. This paper offers an overview on the classification of American think tanks and mainly chooses CNAS (Center for a New American Security); CSIS (institute of international relations strategy); Brookings (Brookings institution) as examples to discuss the cooperation between think tanks and the media on public diplomatic policies in three periods: prior to the release by the media; while promoting of the policy; encountering problems after implementing. This paper concludes by emphasizing on the use of media for think tanks on public diplomatic policies, especially for counter-terrorism cooperation, and proposes several suggestions for China.

No abstract