naa a22 4500 510766749 CHVBK 20180411083159.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s12043-013-0537-0 doi (NATIONALLICENCE)springer-10.1007/s12043-013-0537-0 NINGTHOUJAM R. Chemistry Division, Bhabha Atomic Research Centre, 400 085, Mumbai, India aut Finding confined water in the hexagonal phase of Bi0.05Eu0.05Y0.90PO4· x H2O and its impact for identifying the location of luminescence quencher [Elektronische Daten] [R NINGTHOUJAM] 1H MAS NMR spectra of Bi0.05Eu0.05Y0.90PO4·xH2O show chemical shift from −0.56ppm at 300K to −3.8ppm at 215K and another one at 5-6ppm, which are related to the confined or interstitial water in the hexagonal structure and water molecules on the surface of the particles, respectively. Negative value of the chemical shift indicates that H of H2O is closer to metal ions (Y3 +  or Eu3 + ), which is a source of luminescence quencher. H coupling and decoupling 31P MAS NMR spectra at 300 and 250K show the same chemical shift (−0.4ppm) indicating that there is no direct bond between P and H. It is concluded that the confined water is not frozen even at 215K because of the less number of H-bonding. Indian Academy of Sciences, 2013 Confined water nationallicence hexagonal structure nationallicence luminescence nationallicence Pramana Springer-Verlag 80/6(2013-06-01), 1055-1064 0304-4289 80:6<1055 2013 80 12043 https://doi.org/10.1007/s12043-013-0537-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12043-013-0537-0 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- NINGTHOUJAM R. Chemistry Division, Bhabha Atomic Research Centre, 400 085, Mumbai, India aut NATIONALLICENCE 773 0- Pramana Springer-Verlag 80/6(2013-06-01), 1055-1064 0304-4289 80:6<1055 2013 80 12043 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer