中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
2,5-二(2-噻吩基)-3,4-二胺 | 3',4'-diamino-2,2':5',2''-terthiophene | 185691-91-2 | C12H10N2S3 | 278.423 |
—— | 5,5''-dibromo-[2,2:5',2''-terthiophene]-3',4'-diamine | 1030627-33-8 | C12H8Br2N2S3 | 436.215 |
—— | N,N'-bis(2-pyridylmethyl)-3',4'-diamino-2,2':5',2''-terthiophene | 1252652-43-9 | C24H20N4S3 | 460.648 |
The synthesis and characterization of three new tetradentate “bispicen-type” ligands containing a substituted thiophene heterocycle are described [2,5-thienyl substituents = H (7), Ph (8), or 2-thienyl (9)]. Iron(II) bis(thiocyanate) coordination complexes containing 7–9 were prepared, and the electronic and variable-temperature magnetic properties of complexes containing 7 (10) and 9 (12) are described. Complex 10 features a gradual and incomplete spin crossover in the solid state, and 12 remains high-spin over the entire temperature range. Complex 11 is extremely unstable and rearranges to another iron(II) complex (13), which was structurally characterized. The temperature-dependent magnetic properties of 13 are described as a one-dimensional ferromagnetic chain, with interchain antiferromagnetic interactions and (or) zero-field splitting dominant at low temperatures. The magnetic analysis is corroborated by the molecular packing and density functional theory calculations, which suggest intermolecular interactions between coordinated thiocyanate ligands bearing a significant spin density.