Publikationsdatum:
2016-01-30
Beschreibung:
Three multi-dentate 1, 2,4-triazole derivative ligands containing different 4-substituted groups, namely N-1, 2,4-triazol-4-yl(pyridin-3-yl)methylenimine (L 1 ), N-1, 2,4-triazol- 4-yl(pyridin-4-yl)methylenimine (L 2 ), and 4-(2-pyridine)-1, 2,4-triazole (L 3 ) were used to isolate five iron(II) and zinc(II) coordination frameworks, [Zn(μ 2 -L 1 )Cl 2 ] ( 1 ), [Zn(μ 2 -L 2 )Br 2 ] ( 2 ), [Fe(L 1 ) 2 (NCS) 2 (H 2 O) 2 ] ( 3 ), [Fe(L 3 ) 2 (dca) 2 (H 2 O) 2 ] ( 4 ), and [Fe(L 3 ) 2 (μ 2 -dca)] ( 5 ) (dca = dicyanamide anion). When different zinc(II) salts were used to react with L 1 and L 2 under solvothermal conditions, two one-dimensional (1D) zinc(II) coordination frameworks 1 and 2 containing four-coordinate central zinc(II) atoms were isolated. 1 is a 3D achiral supra-molecular framework, whereas 2 is a 3D chiral supra-molecular framework containing helical chains on a 2 1 axis. 3 is a mono-nuclear iron(II) coordination framework containing six-coordinate central Fe II atoms. When L 3 was employed, mono-nuclear iron(II) framework 4 and 1D iron(II) chain 5 could be isolated when different amounts of Nadca were introduced into the reaction system. Variable-temperature magnetic susceptibility data of 3 – 5 were recorded in the 2–300 K temperature range indicating weak anti-ferromagnetic interactions. The solid-state luminescent properties of coordination polymers 1 and 2 were also investigated at room temperature.
Print ISSN:
0044-2313
Digitale ISSN:
1521-3749
Thema:
Chemie und Pharmazie
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