摘要
Six new alkaline-earth metal carboxyphosphonates [Mg(H 2 O)(H 2 PMIDA)] (1), [Sr(H 2 O)(H 2 PMIDA)] (2), [Sr 2 (H 2 O)(PMIDA)] (3), [Sr 2 (HPO 4 )(H 2 PMIDA)] (4), [Ba 2 (HPO 4 )(H 2 PMIDA)] (5), and [Ba 2 (H 2 O)(H 2 PMIDA) 2 ] (6) (H 4 PMIDA = N-(phosphonomethyl) iminodiacetic acid) have been synthesized solvothermally in order to study the coordination behavior of H 4 PMIDA towards alkaline-earth metal ions (Mg 2+ , Sr 2+ , and Ba 2+ ) and the structural features of the resulting polymeric compounds. The newly synthesized compounds have been characterized by elemental analysis, UV-Vis spectrometry, IR spectroscopy, thermogravimetry analysis, solid state 31 P MAS NMR, powder X-ray diffraction analysis and single crystal X-ray diffraction techniques. The single crystal structure analysis revealed structural variability of the prepared compounds. Compounds 1, 2, 4 and 5 are three-dimensional with the H 2 PMIDA skeletons connecting the inorganic parts to each other, whereas compound 3 has a layered structure. Compounds 2, 4 and 5 contain helical structural motifs. In addition, the extrinsic luminescent properties of Eu(iii)- and Tb(iii)-doped compounds 1, 4 and 5 have also been studied. © 2013 The Royal Society of Chemistry.