New heteropolyniobates based on a bicapped Keggin-type {VNb14} cluster with selective adsorption and photocatalytic properties

New heteropolyniobates based on a bicapped Keggin-type {VNb14O42(NO3)(2)} (abbreviated as {VNb14}) cluster have been successfully synthesized by conventional aqueous methods. These clusters are a type of multifunctional material, which exhibit selective adsorption for methanol, ethanol and water and photocatalytic H-2 evolution activity.