The 77Se NMR spectra of a series of ferrocenyl selenium derivatives, e.g., I, several alkyl seleno ethers and aryl seleno ethers are reported and the chem. shift of 77Se in these compounds were obtained. Particular emphasis is drawn to factors influencing the 77Se NMR chem. shift. The chain length, degree of branching and electron withdrawing ability of substituents directly bound to Se influence the chem. shift of Se. In addition the 77Se chem. shift of ferrocenyl selenium compounds is also influenced by the solvent.

Key words: NMR SPECTROMETRY, SELENIUM ISOTOPES, SOLVENT EFFECT, CHEMICAL SHIFT, ORGANO SELENIUM COMPOUNDS, FERROCENE P