Synthesis, Structure and Properties of Compounds Derived from Kotoite‐related Structures: A2MB2O6 (A=Zn, Ba, Pb; B=Pb, Ba, Zn, Cu)

Abstract A series of compounds with the general formula A 2 MB 2 O 6 (A=Zn, Ba, Pb; B=Pb, Ba, Zn, Cu) related to the kotoite structure has been prepared employing high‐temperature solid state methods. The substitution of transition elements in place of Zn 2+ ions resulted in colored compounds. The optical absorption spectra could be explained based on Tanabe‐Sugano diagram and allowed d‐d transitions. Dielectric studies on Ba 2 ZnB 2 O 6 , (Ba 1.5 Pb 0.5 )ZnB 2 O 6 , PbZn 2 B 2 O 6 , Pb 1.5 Zn 1.5 B 2 O 6 , BaZn 2 B 2 O 6 and Pb 2 CuB 2 O 6 at room temperature indicate reasonable values at low frequencies, which decrease on increasing frequencies. Magnetic study of synthesized single‐phase compounds BaZnCoB 2 O 6 and Pb 2 CuB 2 O 6 have been performed. The substitution of Eu 3+ , Tb 3+ and Tm 3+ in place of Ba 2+ in Ba 2 ZnB 2 O 6 , gives rise to the expected emission of red, green and blue colors. Suitable modifications of the different phosphors in Ba 2 ZnB 2 O 6 , resulted in white‐light emission in Ba 2 ZnB 2 O 6 . The Pb 2 CuB 2 O 6 compound was found to be a good catalyst in the ipso‐hydroxylation of arylboronic acids.