Incorporating different secondary building units of {Bi2}, {Bi8} and {Bi10} to construct diversity of luminescent bismuth–organic frameworks

Abstract

Three new bismuth–organic compounds, namely, Bi(OH)(2,6-pdc)·H₂O (1), Bi₄(OH)₄(2,6-pdc)₄(H₂O)₃·H₂O (2) and Bi₅(OH)₅(2,6-pdc)₅(H₂O)₄·H₂O (3) (2,6-H₂pdc = pyridine-2,6-dicarboxylate) have been obtained by incorporating different Bi subunits as building blocks under hydrothermal conditions. Compound 1 contains dimeric {Bi₂} units and these are further linked by 2,6-pdc²⁻ ligands into a 2D net with 3⁶ topology. Compounds 2–3 display 4⁴ net topology by using linear {Bi₈} and {Bi₁₀} as secondary building units (SBUs), respectively. Compounds 1–3 display yellow and blue luminescence, respectively. Furthermore, the PXRD, TGA, UV-visible and IR spectra of 1–3 were also studied.