Paramagnet enhanced nuclear spin relaxation in H2O@Open-C60 and H2@Open-C60

Yongjun Li; Xuegong Lei; Judy Y C Chen; Yasujiro Murata; Nicholas J Turro; Ronald G Lawler

doi:10.1021/ol402111x

Paramagnet enhanced nuclear spin relaxation in H2O@Open-C60 and H2@Open-C60

Org Lett. 2013 Sep 20;15(18):4746-9. doi: 10.1021/ol402111x. Epub 2013 Sep 4.

Authors

Yongjun Li¹, Xuegong Lei, Judy Y C Chen, Yasujiro Murata, Nicholas J Turro, Ronald G Lawler

Affiliation

¹ Department of Chemistry, Columbia University , New York, New York 10027, United States, Department of Chemistry, Brown University , Providence, Rhode Island 02912, United States, and Institute for Chemical Research, Kyoto University , Kyoto 611-0011, Japan.

PMID: 24004381
DOI: 10.1021/ol402111x

Abstract

Relaxation rates of endo-H2O in H2O@Open-C60 in the presence of a nitroxide radical and of their nitroxide derivatives have been measured and are compared with effects for endo-H2 in similar cages. T1 relaxation enhancement of the endo-H2O and H2 induced by either intra- or intermolecular interaction is relatively insensitive to the presence of a cage opening. Enhancement of intermolecular relaxation is observed, however, when the cage opening has an OH group.