Supramolecular Recognition: Protonmotive-Driven Switches or Motors?
A dicationic molecular receptor bearing two cofacially disposed terpyridyl-Pd-Cl units forms stable 1:1 host-guest complexes with planar, neutral platinum(II) complexes. When the guest is modified to incorporate a pyridine group, the now basic guest is protonated by trifluoroacetic acid in acetonitrile solutions. The basic yellow guest forms a stable, deep red 1:1 host-guest complex with the yellow palladium receptor. Addition of trifluoroacetic acid to this host-guest complex leads to the displacement of the guest from the receptor. It is proposed that the dissociation of the guest is caused by electrostatic repulsion between the dicationic receptor and the positively charged protonated guest. Addition of base restores the host-guest complex. This protonmotive translocation of the guest from the host to the solution is discussed in terms of the mechanisms that drive molecular motors, the power stroke and the Brownian ratchet. It is concluded that the system is best described as a molecular switch that operates by the same mechanism as one stroke of a molecular motor.
Crowley, James D.,Goshe, Andrew J.,Steele, Ian M.,Bosnich, Brice
p. 1944 - 1955
(2007/10/03)
BENZOXAZOLINONES. IV. REACTION OF BENZOXAZOLINONE AND BENZOXAZOLINETHIONE WITH ALKYL β-CHLOROVINYL KETONES
The reaction of benzoxazolinone and benzoxazolinethione with alkyl β-chlorovinyl ketones have been studied.The reaction products are N-(β-acylvinyl)benzoxazolinones and N-(β-acylvinyl)benzoxazolinethiones.The reaction of alkali-metal salts of benzoxazolinone with alkyl β-chlorovinyl ketones leads to the opening of the oxazolinone ring.The structures of the compounds synthesized have been studied by IR, mass, and PMR spectroscopy.
Aflyatunova, R. G.,Aliev, N. A.,Kadyrov, Ch. Sh.,Yagudaev, M. R.
p. 478 - 482
(2007/10/02)
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