Solvent-dependent chirality transformation: Construction of a helical homochiral silver(I) MOF using the V-shaped ligand 3-Aminobenzoate.

Less attention has been paid to the solvent-dependent chirality transformation behavior of coordination compounds when using achiral precursors. We have successfully prepared one known helical achiral compound ( α -[AgL] n ∙ n H 2 O, 1 ) using water or DMSO as a solvent, one new helical homochiral MOF ( β -[AgL] n ∙ n H 2 O, 2 ) using DMF, dimethyl acetamide or ethanol as a solvent, and one new non-helical achiral compound ([Ag 2 L(NO 3 )] n , 3 ) using n -propyl alchohol or cyclohexanol as a solvent, with the V-shaped achiral ligand 3-aminobenzoic acid (HL) as a ligand. Achiral 1 can be converted from chiral isomeric 2 through recrystallization in water. Such successive chirality transformation (achirality → chirality → achirality) behavior is probably proportional the polarity of the used solvent: cyclohexanol ( 3 ) < n -propyl alchohol ( 3 ) < ethanol ( 2 ) < dimethyl acetamide ( 2 ) < DMF ( 2 ) < DMSO ( 1 ) < water ( 1 ). A preliminary study revealed that the isomeric compounds 1 and 2 displayed significantly different photoluminescence. [ABSTRACT FROM AUTHOR]