Four new spin-crossover salts of [Fe(3-bpp)(2)](2+) (3-bpp=2,6-bis[1H-pyrazol-3-yl]pyridine)
King, P; Henkelis, JJ; Kilner, CA; Halcrow, MA
| HERO ID | 2032748 |
|---|---|
| In Press | No |
| Year | 2013 |
| Title | Four new spin-crossover salts of [Fe(3-bpp)(2)](2+) (3-bpp=2,6-bis[1H-pyrazol-3-yl]pyridine) |
| Authors | King, P; Henkelis, JJ; Kilner, CA; Halcrow, MA |
| Journal | Polyhedron |
| Volume | 52 |
| Page Numbers | 1449-1456 |
| Abstract | Four new salts of the well-known spin-crossover centre [Fe(3-bpp)(2)](2+) are described: [Fe(3-bpp)(2)][M(CN)(2)](2) (M = Ag, 1; M = Au, 2), [Fe(3-bPP)(2)][Au(SCN)(2)](2) (3) and [Fe(3-bpp)(2)][Bph(4)](2) (4) are reported. Monohydrate crystals of 1 and 2 are isostructural, and are better formulated as [Fe(3-bpp)(2)](2)[M(CN)(2)][M-3(CN)(6)]center dot 2H(2)O (M = Ag or Au) with the mononuclear and trinuclear anion sites being disordered within each anion dyad. These groups are linked into a 2D network topology through N-H center dot center dot center dot X (X = N or O) hydrogen bonding between the cations and the cyanometallate anions, and the lattice water. In contrast, the complex cations in the solvate 4 center dot 2CH(3)NO(2)center dot(C2H5)(2)O are completely encapsulated by phenyl groups from the BPh4- anions. Dried powder samples of 1-4 all exhibit very gradual thermal spin-state transitions centred at 198 <= T-1/2 <= 291 K. ES mass spectrometry of 1-3 implies that extensive ligand exchange between the iron and coinage metal ions occurs in solution. Solid 1 and 2 are not emissive at room temperature upon irradiation in the UV. (C) 2012 Elsevier Ltd. All rights reserved. |
| Doi | 10.1016/j.poly.2012.03.038 |
| Wosid | WOS:000318747100181 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | Iron; Spin-crossover; Crystal structure; Magnetic measurements |