Low-melting cationic 3d-transition metal complexes of azole-based ligands

2‐Amino‐5‐(2‐pyridyl)‐thiadiazole as Bidentate Ligand

“…The NTf 2 -salt 4·H 2 O was obtained using vacuum-dried Fe(NTf 2 ) 2 ·6H 2 O, prepared as published elsewhere. [21] All 3:1-type iron(II) complexes of H 2 L isolated in this work presumably exhibit the metal ion in its low-spin (ls) state, as As it is often observed that, when the ligand field is slightly too strong to generate a thermal SCO of an iron(II) complex, a thermal SCO is observed for the corresponding cobalt(II) complex, variable temperature magnetic measurements were performed on the cobalt(II) complex 5·1.5MeOH. In this case, however, the cobalt(II) ion was confirmed to reside in its high-spin (hs) state, even at very low temperatures without indication of a thermally induced SCO (Figure 4).…”

“…[9] Ligand cores, especially suitable for the formation of transition metal complexes, are 2-pyridine substituted azole ligands that have repeatedly demonstrated their suitability to function as bidentate chelating ligands. [9][10][11][12][13][14][15][16][17][18][19][20][21] And especially the thiadiazole unit was found to form mononuclear transition metal complexes of iron(II), cobalt(II), nickel(II) and copper(II), [22] including iron(II) spin crossover complexes. [16,22,23] The results presented here have been obtained while studying the complexation behavior of 2-amino-5-(2-pyridyl)-1,3,4-thiadiazole (H 2 L).…”

FeCl3‐Mediated Three‐Component Cascade Reaction: An Effective Approach to the Construction of Highly Functionalized Pyrrolo[1,2‐c]quinazolinones

“…The analogous peak unfortunately is very small in the mass spectrum of the triflimide compound 4 ·H 2 O, but a peak at 691.9148 was assigned to the fragment [Fe(H 2 L ) 2 NTf 2 ] + (Figure S5, Supporting Information). The NTf 2 ‐salt 4 ·H 2 O was obtained using vacuum‐dried Fe(NTf 2 ) 2 ·6H 2 O, prepared as published elsewhere 21…”

“…For this end the amino function has turned out to be very suitable 9. Ligand cores, especially suitable for the formation of transition metal complexes, are 2‐pyridine substituted azole ligands that have repeatedly demonstrated their suitability to function as bidentate chelating ligands 9–21. And especially the thiadiazole unit was found to form mononuclear transition metal complexes of iron(II), cobalt(II), nickel(II) and copper(II),22 including iron(II) spin crossover complexes 16,22,23.…”

Thermal properties and crystal structures of cobalt(III)–cyclam complexes with the bis(trifluoromethanesulfonyl)amide anion (cyclam = 1,4,8,11-tetraazacyclotetradecane)

“…Indeed, these modifications of Schiff base complexes [24] produced ionic liquids [22,25]. There is also interest in the thermal properties of [Tf 2 N] salts with chelate complexes [26]. In the present study, to investigate the effects of the anion and substituents on the thermal properties of cyclam complexes, we prepared the [Tf 2 N] and hexafluorophosphate ([PF 6 ] À ) salts of the cobalt cyclam complex and its N-monoalkyl derivatives [Co(R-cyclam)Cl 2 ]X (R = H (1), C 3 H 7 (2), C 6 H 13 (3); X = [Tf 2 N], [PF 6 ]; Fig.…”