1 31 P NMR as a Tool for Studying Incorporation of Ni, Co, Fe and Mn into Aluminophosphate Zeotypes Gregor Mali a* , Alenka Risti a , Ven eslav Kau i a,b a National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia, b University of Ljubljana, SI-1000 Ljubljana, Slovenia RECEIVED DATE 31 P NMR of Ni, Co, Fe and Mn modified AlPOs Corresponding author’s e-mail address: gregor.mali@ki.si Incorporation of moderate amounts of Ni(II), Co(II), Fe(II/III) and Mn(II/III) into aluminophosphate zeotype AlPO 4 -34 and Fe(II/III) into aluminophosphate zeotype AlPO 4 -36 was studied by broadline 31 P NMR. The technique provided direct evidence on isomorphous substitution of framework aluminum by transition metals and allowed us to determine the extent of the substitution. 31 P NMR proved to be complementary to other spectroscopic techniques such as XAS, Mössbauer, EPR and ENDOR spectroscopies. The position of the NMR signal belonging to phosphorus in P(OAl) 3 (OMe) environment depended mostly on the magnitude of the hyperfine interaction between a phosphorus nucleus and an unpaired electron, which was delocalized from transition metal atom Me due to covalent bonding. Width of the NMR signal was dominated by dipolar coupling among phosphorus nuclei and nearest paramagnetic centers. In addition, broadline NMR of ethylenediamine-templated manganese- phosphate (C 2 H 10 N 2 )[Mn 2 (HPO 4 ) 3 (H 2 O)], which was used as a model compund, showed that based on