Synthesis, structure and magnetic behavior of a novel series of trinuclear windwheel complexes

ABSTRACT

A new family of trinuclear windwheel complexes with molecular formula [M^II₃(tpa)₃(μ‐ttc)](ClO₄)₃·n(sol) (ttc = 1,3,5‐triazine‐2,4,6‐trithiol; tpa = tris(2‐pyridylmethyl)amine; M = Mn, n = 2, sol = CH₃CN, 1; M = Co, n = 1, sol = CH₃CN, 2; M = Ni, n = 0, 3) were synthesized and characterized. Single‐crystal X‐ray diffraction revealed that three metal centers in 1−3 are connected by ttc bridge, forming a regular triangular M^II₃ core. Each metal center is bonded by chelating S, N atoms from ttc and by N atoms from tpa. Magnetic studies showed that 1–3 displayed antiferromagnetic behavior and further gave the easy‐axis anisotropy (D = −0.77 cm⁻¹ for 1 and −8.13 cm⁻¹ for 2) and easy‐plane anisotropy (D = 5.08 cm⁻¹ for 3). Moreover, 2 exhibited field‐induced slow magnetic relaxation behavior and their effective energy barriers were roughly evaluated U_eff = 6.9 K.

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