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Two new mononuclear complexes, [Zn(3-Hcpa) 2 (H 2 O) 4 ] ( 1 ) and [Zn(3,5,6-tcpa) 2 (H 2 O) 4 ] [Zn(3,5,6-tcpa) 2 (H 2 O) 2 ] ( 2 ) (3-H 2 cpa = 3-carboxy-phenoxyacetic acid, 3,5,6-Htcpa = 3,5,6-trichloro pyridine-2-oxyacetic acid), were synthesized and structurally characterized. The single-crystal X-ray diffraction analysis showed that in  1  the Zn II  ion lies on an inversion center of an octahedron formed by four aqua ligands and two carboxy oxygen atoms of two unidentate 3-Hcpa −  anions in  trans -arrangement. Complex  2  is a co-crystal consisting of two discrete and stereochemically different complexes: one with an octahedrally, and the other a tetrahedrally coordinated zinc center. The six-coordination about the first Zn II  ion comprises four oxygen atoms from water (H 2 O) molecules and two from the carboxy groups of monodentate  trans -related 3,5,6-tcpa −  ligands. The four-coordination about the second Zn II  ion is comprised of two H 2 O ligands and two unidentate carboxy oxygen atoms from 3,5,6-tcpa −  ligands. O–HLO hydrogen bond and/or ClLCl halogen bond interactions play an important part in construction of the three-dimensional (3D) networks for  1  and  2 . The photoluminescence spectra reveal that both  1  and  2  display luminescent properties in the violet region.

Two mononuclear zinc(II) complexes constructed by two types of phenoxyacetic acid ligands: syntheses, crystal structures and fluorescence properties