Abstract
Deuterium adsorbed onto Rh particles of various sizes (1.1–9 nm) supported on Al 2O 3 was studied by 2H NMR spectroscopy. Near zero overpressure of D 2, δD shifts downfield with increasing size of particles, approaching a limiting value ca. −120 ppm when particle size exceeds 2 nm. The dependence of δD on particle size of the odd-electron metal Rh(4 d 7) is opposite to the dependence observed for the even-electron metal Pt(5 d 8) which we have also investigated. δD also shifts downfield upon increased overpressure of D 2. All these variations of chemical shifts can be satisfactorily accounted for by considering the spin density on the metal particle. The linewidth depends on the particle size but not on the overpressure of D 2. Hence the major relaxation mechanism is not paramagnetic interaction which is responsible for the variations of δD.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
