Research and Development

@article{Yu2016,

title = {Cationic and Neutral Rotaxanes Having Different Functional Groups in the Axle Molecule and Their Coordination to PtII},

author = {Gilbert U. Yu and Yuji Suzaki and Kohtaro Osakada},

url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/asia.201601554},

doi = {10.1002/asia.201601554},

year  = {2016},

date = {2016-12-14},

journal = {Chemistry - An Asian Journal},

volume = {12},

number = {3},

pages = {372-377},

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. A 1H 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.},

keywords = {“click” reaction, macrocycle shuttling, platinum complex, rotaxanes, triazole ligand},

pubstate = {published},

tppubtype = {article}

}

@article{Fabicon1999,

title = {Interactions of Organozinc Compounds with Crown Ethers and Cryptands:  Formation of R2Zn(18-crown-6) Rotaxanes},

author = {Ronaldo M. Fabicon and Masood Parvez and Herman G. Richey Jr.},

url = {https://pubs.acs.org/doi/abs/10.1021/om990468e},

doi = {10.1021/om990468e},

year  = {1999},

date = {1999-11-01},

journal = {Organometallics},

volume = {18},

number = {24},

pages = {5163-5169},

abstract = {Several pieces of evidence indicate that R2Zn(18-crown-6) rotaxanes are components of solutions prepared from some R2Zn (R = alkyl or aryl) compounds and 18-crown-6, and crystal structures show that Et2Zn(18-crown-6) and Ph2Zn(18-crown-6) solids that precipitate from such solutions have rotaxane structures. By contrast, the R2Zn compounds do not form rotaxanes with 15-crown-5 or its nitrogen equivalent, 1,4,7,10,13-pentamethyl-1,4,7,10,13-pentaazacyclopentadecane. Disproportionation of R2Zn by macrocycles to form coordinated RZn+ cations and R3Zn- anions is less favorable than the corresponding reaction with R2Mg, although Tol2Zn (Tol = p-methylphenyl) and 2,1,1-cryptand do form TolZn(2,1,1-cryptand)+Tol3Zn-.},

keywords = {absorption, chemical structure, ethers, macrocyclic compounds, rotaxanes},

pubstate = {published},

tppubtype = {article}

}