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3 '1 p MAS NMR is used to characterize local phosphorus environments in -P 4 S 3 , P 4 S 7 , P 4 S 9 , and P 4 SI 0 . MAS-NMR spectra of P 4 S 3 enable a chemical shift discrimination of the apical P atoms belonging to the two crystal log raph ically distinct molecules in the unit cell. No line narrowing is observed for the basal P-atoms, indicating reorientation of the molecules about their 03 axes, as previously suggested from neutron diffraction data. MAS-NMR spectra of P 4 S 7 show distinctdoi:10.21236/ada196557 fatcat:pwllp2fvafcipaiwnvoelfthre