2‐Amino‐5‐(2‐pyridyl)‐thiadiazole as Bidentate Ligand |
| |
| Authors: | Timo Huxel Serhiy Demeshko Julia Klingele |
| |
| Institution: | 1. Institut für Anorganische und Analytische Chemie, Albert‐Ludwigs‐Universit?t Freiburg, Albertstr. 21, 79104 Freiburg, Germany;2. Institut für Anorganische Chemie, Georg‐August‐Universit?t G?ttingen, Tammannstr. 4, 37077 G?ttingen, Germany |
| |
| Abstract: | The amino substituted bidentate chelating ligand 2‐amino‐5‐(2‐pyridyl)‐1,3,4‐thiadiazole (H2 L ) was used to prepare 3:1‐type coordination compounds of iron(II), cobalt(II) and nickel(II). In the iron(II) perchlorate complex FeII(H2 L )3](ClO4)2·0.6MeOH·0.9H2O a 1:1 mixture of mer and fac isomers is present whereas FeII(H2 L )3](BF4)2·MeOH·H2O, CoII(H2 L )3](ClO4)2·2H2O and NiII(H2 L )3](ClO4)2·MeOH·H2O feature merely mer derivatives. Moessbauer spectroscopy and variable temperature magnetic measurements revealed the FeII(H2 L )3]2+ complex core to exist in the low‐spin state, whereas the CoII(H2 L )3]2+ complex core resides in its high‐spin state, even at very low temperatures. |
| |
| Keywords: | N Ligands Chelating ligands Azoles mer‐coordination fac‐coordination |
|
|
