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A representative NMR spectra of POMs. (a) 31P NMR spectrum of (NH4)14[NaP5W30O110]·31H2O ((NH4)14-P5W30) in H2O/D2O (δ = −9.4 ppm); (b) 51V NMR spectrum of Na6[V10O28]·18H2O (Na6-V10) in H2O/D2O (δ = −423.3 V10A, −498.8 V10B, −514.4 V10C and −576.5 V1 ppm); (c) 183W NMR spectrum of Na6[TeW6O24]·22H2O (Na6-TeW6) in H2O/D2O (δ = −115.6 ppm).
