A Solid‐State ¹⁷O NMR Study of Local Order and Crystallinity in Amine‐Templated Mesoporous Nb Oxide

Abstract

Order locally: 17O magic-angle-spinning NMR spectroscopy of bulk sol–gel-prepared Nb2O5 and mesoporous, template-free Nb2O5 (see picture) shows very high local order in the mesoporous sample. The oxygen atoms are coordinated only as ONb2 in contrast with bulk phases in which the oxygen atoms are always present in a mixture of ONb2 and ONb3 coordination environments.