18750-95-3Relevant articles and documents
Molecular Turnstiles Regulated by Metal Ions
Wang, Guangxia,Xiao, Hongmei,He, Jiaojiao,Xiang, Junfeng,Wang, Ying,Chen, Xuebo,Che, Yanke,Jiang, Hua
, p. 3364 - 3371 (2016)
A family of novel molecular turnstiles 1-3 composed of two stators with pyridyl binding sites and a different-sized triptycene rotor was synthesized. The molecular turnstiles behave in an open state at room temperature in the absence of metal ions but display significantly different closed states in the presence of Ag+ and Pd2+. The Ag+-mediated turnstiles 1-3Ag exhibited closed states but unreadable bistability at ambient temperature because the Ag+-mediated macrocyclic framework is not able to restrict the rotations of the rotors; while temperature was decreased, the macrocyclic frameworks became stable enough to halt the rotations of the rotors, eventually leading to the readable closed states for 1-3Ag. In contrast, Pd2+-mediated macrocyclic frameworks are stable, giving rise to a detectable closed state of turnstiles 1-3Pd in a wide range of temperatures. These findings have also been supported by DFT calculations.
Self-assembled trigonal prismatic altitudinal rotors with triptycene paddle wheels
Caskey, Douglas C.,Wang, Bing,Zheng, Xiaolai,Michl, Josef
, p. 1970 - 1985 (2005)
We describe the synthesis of a trigonal prismatic molecular rotor by self-assembly from paddle-wheel carrying molecular rods and trigonal star connectors in a 3:2 ratio. The rod is 9,10-diethynyltriptycene terminated in transversely reactive [Pt(dppp)]+ groups (dppp = 1,3- bis(diphenylphosphino)propane) and the connector is 1,3,5-tris[(4-pyridyl) ethynyl]benzene. The structure of the molecular rotor has been established by 2-D NMR and MS, including diffusion-ordered NMR and collision-induced dissociation.
The relationship between molecular structure and electronic properties in dicyanovinyl substituted acceptor-donor-acceptor chromophores
Tarku?, Simge,Eelkema, Rienk,Grozema, Ferdinand C.
, p. 4994 - 5004 (2017/07/27)
In this contribution we describe a combined experimental and theoretical study of the relation between the molecular structure and the electronic properties of conjugated donor-acceptor type chromophores for light-harvesting applications. A series of model systems was synthesized where a central anthracene (electron donor) is connected to dicyanovinyl units (electron acceptor) through a π-conjugated spacer. The study of the redox and optical properties of these chromophores and of reference compounds without dicyanovinyl units allows us correlate the electronic properties to the presence of the electron withdrawing groups and the molecular conformation. Comparison with calculated electronic structure shows that the construction of chromophores that consist of electron donating and accepting units does not always follow the simple rules that are generally used in the design of such molecules. The results show a subtle relation between the charge transfer character and the geometry of the molecules. In some cases this leads to significant contribution of charge transfer excitation to the absorption spectra of some chromophores while such contributions are completely absent in others.
Cascade energy transfer and tunable emission from nanosheet hybrids: Locating acceptor molecules through chiral doping
Goudappagouda,Wakchaure, Vivek Chandrakant,Ranjeesh, Kayaramkodath Chandran,Abhai, Chalona Antony Ralph,Babu, Sukumaran Santhosh
supporting information, p. 7072 - 7075 (2017/07/10)
Light harvesting donor-acceptor assemblies are indispensable to efficiently tap photons. In an attempt to improve the light harvesting efficiency of an acceptor doped assembly, we design and synthesize a donor-acceptor-donor triad which exhibits an except
