Ultrahigh resolution 29Si n.m.r. spectroscopy: natural abundance studies of oxygen-18/16 isotope effects on 29Si nuclear shielding
Abstract
18/16 O Isotope effects on 29Si chemical shifts have been measured in various organosilanes for the first time; their magnitude depends on the nature of the Si–O chemical bond, particularly, on the extent of dπ–pπ conjugation.