Structural diversity in serine derived homochiral metal organic frameworks

Abstract

Two new Zn(II) and Cd(II) based homochiral metal–organic frameworks (MOFs) [SerCdOAc and Zn(Ser)2] have been synthesized using pyridyl functionalized amino acid, viz., serine, as an organic linker. The SerCdOAc structure is three dimensional, while that of the Zn(Ser)2 is two dimensional. The polar voids of the corresponding MOFs are filled with solvent molecules (water in the case of SerCdOAc and methanol in the case of Zn(Ser)2). In both cases, metal centres, i.e., Zn(II) and Cd(II), are hexacoordinated. However, with a change in the solvent for synthesis, ligand coordination mode and incorporation of additional coordinated anion resulted in a great change in the final MOF architecture. Herein, for the first time, we could achieve structural variety and synthesize MOFs composed of only metal ion and pyridyl functionalized amino acid linker. Two new Zn(II) and Cd(II) based homochiral metal–organic frameworks (MOFs) [SerCdOAc and Zn(Ser)2] have been synthesized using pyridyl functionalized amino acid viz. Serine as an organic linker. The SerCdOAc structure is three dimensional, while Zn(Ser)2 have two dimensional architecture. The polar voids of the corresponding MOFs are filled with solvent molecules [water in case of SerCdOAc and methanol in case of Zn(Ser)2]. In both cases, metal centers [Zn(II) and Cd(II)] are hexacoordinated. However, change in the solvent for synthesis, ligand coordination mode and incorporation of additional coordinated anion resulted in a great change in the final MOF architecture. Herein, for the first time, we could achieve structural variety as well as able to synthesize MOFs composed of only metal ion and pyridyl functionalized amino acid linker.