Linear trinuclear coordination compounds with 4-ethyl-1,2,4-triazole. Structure and magnetic properties

Synthesis, Crystal Structure, Magnetic Properties and57Fe Mössbauer Spectroscopy of the New Trinuclear [Fe3(4-(2′-hydroxyethyl)-1,2,4-triazole)6(H2O)6](CF3SO3)6 Spin Crossover Compound

“…This characteristic has already been observed for instance in the linear trinuclear compounds with the related ligand 4-ethyl-1,2,4-triazole (etrz), [M 3 II (etrz) 6 -(H 2 O) 6 ](CF 3 SO 3 ) 6 [M ϭ Fe (HS and LS), [22] Mn, [27] Zn [28] ], where a C3 2 symmetry is present. The N1,N2Ϫ1,2,4-triazole bridging ligands are all identical by symmetry and link the Fe II ions with FeϪNϪN bond angles of 127.59(8)°and 122.66(8)°in the LS state and of 125.7(2)°and 122.8(2)°in the HS state.…”

A CuII Chain Compound Showing a Ferromagnetic Coupling through Triple N1,N2‐1,2,4‐Triazole Bridges

“…[22] The magnetic data could not, however, be related to the structural parameters. Only an X-ray crystallographic study of a low quality at 298 K has been reported for [Cu 3 (metrz) 6 4 , revealing rather short Cu···Cu separations of 3.719(7) Å , which could be related to the dynamic JahnϪTeller effect involving the central Cu II ion leading to a perfectly symmetric octahedron with six relatively short CuϪN distances of 2.14(5) Å .…”

“…Indeed, the AF coupling between nearest- , [20] whereas the isotropic exchange constant is only Ϫ1.01 (2) 4 (metrz ϭ 3-methyl-4-ethyl-1,2,4-triazole) [21] and [Cu 3 (etrz) 9 (H 2 O) 3 ](CF 3 SO 3 ) 6 (etrz ϭ 4-ethyl-1,2,4-triazole), [22] indicate a weak overall ferromagnetic (F) interaction. Unfortunately, the magnetic data could not be satisfactorily interpreted, nor could it be related to the structural features, possibly due to the lack of detailed crystallographic data.…”

Oligometallic cobalt 3,5-dimethylpyrazolate complexes: synthesis, structural and magnetic studies

“…Reedijk and co-workers reported studies of trimetallic and bimetallic, first row transition metal complexes in which the bridging ligands were alkylated 1,2,4-triazolyl moieties (1 2, 16-22) and several of these reports describe work performed on Co(I1) species. In their analyses of the magnetic properties of these compounds, however, JI3 was assumed to be zero and they cited several experimental findings to justify neglect of J,, in their modelling procedures (12,17,19,21). ple triazolyl bridges (23).…”