Three interesting coordination compounds based on metalloligand and alkaline-earth ions: Syntheses, structures, thermal behaviors and magnetic property

•Three interesting coordination compounds based on metalloligand and alkaline-earth ions have been synthesized.•The structures of the prepared compounds have been investigated by different spectroscopic techniques.•The magnetic property of coordination compound 2 has been studied.

Based on metalloligand LCu ([Cu(2,4-pydca)2]2−, 2,4-pydca2− = pyridine-2,4-dicarboxylate) and alkaline-earth ions (Ca2+, Sr2+, and Ba2+), three interesting coordination compounds, [Ca(H2O)7][LCu·H2O]·H2O (1), {Sr[LCu·H2O]·4H2O}n (2), and {Ba[LCu·H2O]·8H2O}n (3), have been synthesized and well-characterized by elemental analysis, infrared spectroscopy, thermogravimetric and single-crystal X-ray diffraction analysis. X-ray crystallographic studies reveal that 1 features a discrete 0D coordination compound, while 2 and 3 exhibit the 2D network and 1D chain structures, respectively. Compound 2 is constructed from {LCu}2 dimers connected with {Sr2} units, which is fabricated by two Sr2+ ions bridged via two μ2-O bridges, while compound 3 is formed by 1D {Ba}n chain linked with metalloligands LCu and exhibits an interesting sandwich like chain structure. It is noted that the coordination numbers of alkaline-earth ions are in positive correlation with their radiuses. Moreover, the magnetic property of compound 2 has been studied.

Graphical abstractThe reaction of metalloligand LCu and alkaline-earth ions (Ca2+, Sr2+, and Ba2+) gave rise to three interesting coordination compounds, [Ca(H2O)7][LCu·H2O]·H2O (1), {Sr[LCu·H2O]·4H2O}n (2), and {Ba[LCu·H2O]·8H2O}n (3), which exhibit discrete, 2D net, and 1D chain structures, respectively. All three compounds have been well-characterized by elemental analysis, infrared spectroscopy, thermogravimetric and single-crystal X-ray diffraction analysis. The magnetic property of compound 2 has also been studied.Figure optionsDownload full-size imageDownload as PowerPoint slide