The development of highly ultraviolet (UV) and near-infrared (NIR) absorbent transparent coatings is an important enabling technology and area of research for environmental sustainability and energy conservation. Different amounts of K4[{Nb5TaXi12}Xa6] cluster compounds (X = Cl. Br) dispersed into polyvinylpyrrolidone matrices were prepared by a simple. nontoxic and low-cost wet chemi... https://www.parisnaturalfoodes.shop/product-category/extra/