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π-Conjugated Macrocyclic Receptor Featuring Redox-Active Viologen Units
摘要： Supramolecular chemistry has recently resulted in the development of highly functional materials and nano-scale molecular machines. Herein, the authors report a macrocyclic receptor 6, featuring two redox-active viologen units. Unlike conventional viologen-based cyclophanes, 6 does not contain ether linkages or chemically labile N-benzylbipyridium bonds, resulting in a more robust system that is fully conjugated.
关键词： macrocycles,viologens,electrochemical receptor
更新于2025-09-23 15:21:01
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Synthesis, crystal structure and photochromic property of a phenethyl viologen bismuth(III) chloride
摘要： Viologen bismuthate halides generally show photochromic properties. In the present work, phenylethyl alcohol was introduced into chloro bismuthates in the hope to prepare photochromic crystalline materials and finally a photochromic inorganic-organic hybrid, (PeV)3(Bi2Cl9)2 (1), based on (PeV2+ = phenethylviologen = N,N′-diphenethyl-4,4′-bipyridinium), has been obtained, whose microstructure contains a discrete dimer [Bi2Cl9]3– counterion identified by single crystal X-ray diffraction. More importantly, 1 exhibits a typical photochromic behavior, which can be mainly attributed to the reversible inter-conversion between the monocation viologen radical [PeV]+? and the viologen dication [PeV]2+.
关键词： π–π Interactions,Inorganic-organic hybrids,Photochromism,Phenethyl viologens
更新于2025-09-19 17:15:36
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2-D Silver-thiocyanate Layers Directed by Viologens: Structural Transformations upon Low Pressure Stimuli, Piezochromic Luminescence, Photocurrent Responses and Photocatalytic Properties
摘要： The reactions of AgSCN with excess KSCN in presence of linear viologens templates afford seven new hybrids, {(MV)[Ag4(SCN)6]}n (1), {(MV)[Ag2(SCN)4]}n (2), {(EV)[Ag4(SCN)6]}n (3), {(EV)[Ag2(SCN)4]}n (4), {(BV)[Ag4(SCN)6]}n (5), {(CMV)[Ag2(SCN)4]}n (6) and {(BMPE)[Ag2(SCN)4]}n (7), (MV2+=methyl viologen, EV2+=ethyl viologen, BV2+=benzyl viologen, CMV2+=cyanomethyl viologen, BMPE2+=1,2-bis(N-methylpyridiniim-4-yl)ethane). The silver-thiocyanate skeletons with formula of [Ag4(SCN)6]n 2n- and [Ag2(SCN)4]n 2n- are the scarce representative examples of the 2-D polypseudorotaxane arrays penetrated (for 1-6) or intercalated (for 7) by viologen dications. Upon the external low pressure stimulus, the 2-D silver-thiocyanate layers penetrated by cations exhibit loser packing with longer Ag-S(N) bond lengths, weaker CT interactions and larger cavities, but the contrary trend can be found on compound with intercalated organic cations. Due to the strong CT interactions between viologens and silver-thiocyanate skeletons, the charge transfers can occur at room temperature. Interestingly, 7 represents typical reversible piezochromic luminescence behaviour. In addition, they show excellent photocurrent responses and efficient photocatalytic degeneration performances on organic dyes. Finally, their band structures and density of states before and after compression based on DFT calculations were executed to correlate their properties.
关键词： Piezochromic Luminescence,Viologens,Silver-thiocyanate,Photocurrent Responses,Photocatalytic Properties,Structural Transformations
更新于2025-09-10 09:29:36