title: Cationic and Neutral Rotaxanes Having Different Functional Groups in the Axle Molecule and Their Coordination to PtII.
abstract: Dibenzo[24]crown-8 (DB24C8) forms rotaxanes with a linear molecule having a dialkylammonium group and a triazole group as well as with the acetylation product of a cationic axle molecule. The former cationic rotaxane is stabilized by multiple intermolecular hydrogen bonds between the NH2+and oxyethylene groups. The neutral rotaxane contains the macrocycle in the vicinity of the terminal aryl group. The co-conformation of both the cationic and neutral rotaxanes can be fixed by coordination of the triazole group of the axle molecule to PtCl2(dmso)2. A1H NMR spectroscopic study on the thermodynamics of the Pt coordination revealed a larger association constant for the rotaxanes than for the corresponding axle molecules and a larger value for the neutral rotaxane than for the cationic rotaxane.
authors.affiliation: Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagastuta, Midori-ku, Yokohama, 226-8503, Japan.|Chemistry Department, School of Science and Engineering, Ateneo de Manila University, Quezon City, Manila, 1108, Philippines.
authors.forename: Gilbert
authors.initials: G
authors.lastname: Yu
authors.affiliation: Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagastuta, Midori-ku, Yokohama, 226-8503, Japan.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Suzaki
authors.affiliation: Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagastuta, Midori-ku, Yokohama, 226-8503, Japan.
authors.forename: Kohtaro
authors.identifier: http://orcid.org/0000-0003-0538-9978
authors.initials: K
authors.lastname: Osakada
keywords: macrocycle shuttling; platinum complex; rotaxanes; triazole ligand; “click” reaction