A novel sandwich Ni-added polyoxometalate with nonlinear optical properties and photothermal conversion performance

An acentric Ni-added polyoxometalate (NiAP), (NH 4 )Cs 7.5 Na 0.5 H 2 [Ni(H 2 O) 3 Ni 3 (H 2 O)(PW 8 O 31 )–(PW 9 O 34 )]Cl·9H 2 O, was made using lacunary directing synthesis, showing good photothermal conversion efficiency (20.5%).