A tetracoordinate Co(II) single molecule magnet based on triphenylphosphine and isothiocyanato group

A simple Co(II) mononuclear complex [Co(PPh3)2(NCS)2] has been studied in details. Its crystal and molecular structure is reported along with its IR a UV–Vis spectra. The DC magnetization studies confirm a sizable zero-field splitting D/hc = −9.4 cm−1 that is also confirmed by quantum-chemical calculations. The AC susceptibility data shows that there is a slow magnetic relaxation with two relaxation branches. The low-frequency branch occurs at about f = 1–10 Hz and it tends to disappear progressively on heating. The high-frequency branch exists at the frequency ranges above f > 200 Hz and this is shifted above the hardware limit (1500 Hz) on heating. The characteristics of this field-induced single molecule magnet strongly depend upon the applied DC field (0.2–0.4 T).

Mononuclear complex [Co(PPh3)2(NCS)2] possesses a sizable zero-field splitting D/hc = −9.4 cm−1. It exhibits a slow magnetic relaxation with two relaxation branches: the low-frequency at f = 1–10 Hz and the high-frequency branch above f > 200 Hz. The characteristics of this field-induced single molecule magnet strongly depend upon the applied external field BDC = 0.2–0.4 T.Figure optionsDownload as PowerPoint slide