Synthesis of an Enantipure Tetrazole-Based Homochiral CuI,II-MOF for Enantioselective Separation.

An enantipure (1S)-1-(5-tetrazolyl)ethylamine (5-eatz) ligand was first employed to construct a homochiral porous metal-organic framework, {[CuI2CuII(5-eatz)2(CN-)(H2O)]+[NO3-]}·[DMF] (1), with unusual ligand-unsupported Cu···Cu interactions. Such a compound shows high stability in water and common organic solvents. Remarkably, it has high enantioselectivity toward (R,S)-1-phenylethanol and (R,S)-1-phenylpropanol with enantiomeric excess values of up to 42% and 48%, respectively.