Homochiral coordination polymers based on proline-derivative: structures, magnetic properties, and selective detection of Cr2O72− anion

By incorporating semi-rigid terephthaloyl mono proline-derived ligand [H 2 TMPro ​= ​terephthaloyl-mono( l -proline)] with the ancillary dipyridyl ligands [bpea ​= ​1,2-bis(4-pyridyl)ethane and bipy ​= ​4,4′-bipyridine], five new homochiral coordination polymers were synthesized. Compounds [Cu 3 (TMPro) 2 (μ 3 -OH) 2 ]·4H 2 O ( 1 ) and [Zn 3 (TMPro) 2 (μ 3 -OH) 2 ]·4H 2 O (2) are isostructural complicated 3D frameworks, which contain the intertwined right- and left-handed helical chains built from the butterfly-shaped [Cu 4 (μ 3 -OH) 2 (RCOO) 6 ] units. Compound [Cu 2 (TMPro) 2 (bpea) 2 (H 2 O) 2 ]·7H 2 O (3) displays a 3D framework composed of Cu1-TMPro left-handed helical chains and Cu2-TMPro right-handed helical chains connected by the bpea ligands. Compound [Cd 4 (TMPro) 4 (bpea) 6 ]·10H 2 O·4C 2 H 5 OH (4) features a 3-fold interpenetrating 3D framework with 5-connected hexagonal bnn topological net constructed from the {Cd-TMPro} chains and bpea ligands. Compound [Ni(TMPro)(bipy)(H 2 O) 3 ] (5) exhibits a {Ni-bipy} 2+ 1D chain decorated by the TMPro 2− anions. Magnetic susceptibility measurements indicate ferromagnetic exchange interactions between Cu(II) ions in 1 . Photoluminescence spectra of 2 show corresponding emission bands of TMPro 2− anions. Additionally, for 2, the K sv value of 553 ​M −1 and detection limit of 70 ​μM imply it can detect the Cr 2 O 7 2− anion. Five homochiral coordination polymers with structural diversity are constructed from a semi-rigid terephthaloyl mono proline-derived ligand. Compound 1 exhibits ferromagnetic interaction between Cu(II) ions, and compound 2 can sense the Cr 2 O 7 2− anion. • Five homochiral coordination polymers were synthesized from a semi-rigid chiral proline-derivative. • Five compounds show diverse structures owing to versatile coordination modes and configurations of TMPro 2− anions. • Compound 1 displays ferromagnetic exchange interactions between Cu(II) ions. • Compound 2 exhibits stronger fluorescent emission bands with the maximal emission peak at 438 ​nm. • Compound 2 is able to efficiently sense the Cr 2 O 7 2− anion.