A proton transfer compound, (ABTH)
+(PydcH)
? (
1), obtained from 2-aminobenzothiazole (ABT) and 2,6-pyridinedicarboxylic acid (Pydc) as well as its Eu(III), Tb(III), and Cu(II) complexes (ABT)
3[Eu(Pydc)
3]·5H
2O (
2), (ABT)
3[Tb(Pydc)
3]·5H
2O (
3), and (ABT)[Cu(Pydc)(PydcH)]·3H
2O (
4) were obtained under ambient conditions and structurally verified by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, powder X-ray diffraction (PXRD), infrared spectroscopy (IR), thermogravimetric analysis (TGA), and magnetic measurements. Compounds
2–
4 are the first known solids containing complex anions with Pydc ligands, 2-aminobenzothiazole cations (ABT), and solvate water molecules. During the synthesis of
3, a secondary phase with the formula ABTCl?H
2O was obtained and characterized by elemental analysis and single-crystal X-ray diffraction. The asymmetric unit of
5 consists of six symmetry independent ABT cations, six chlorides, and six water molecules. The two lanthanide complexes showed characteristic emissions of Eu
3+ and Tb
3+ ions. The good solubilities of these complexes in water and their luminescence properties make them attractive luminescent labels of biological molecules.
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