A new hetero-spin compound derived from 1,4-bis(nitronyl nitroxide)benzene and Mn(II)hexafluoroacetylacetonate for studies on molecular magnetism

A new hetero-spin compound 1 derived from 1,4-bis(nitronyl nitroxide) benzene and Mn(II) hexafluoroacetylacetonate [Mn(hfac)2] was prepared and characterized. Its crystal structure was determined: monoclinic, P2(1)/n, a=16.3260(7) Å, b=13.7080(7) Å, c=18.396(1) Å, β=68.380(5)°, V=3827.3(3) Å3, Z=4. The intramolecular spin–spin exchange parameters for Mn(II) ion and nitronyl nitroxide unit (J12=−108.3 cm−1), two nitronyl nitroxide units (J23=−31.0 cm−1) as well as the intermolecular spin–spin coupling (zJ′=4.9 cm−1) were deduced based on these magnetic data measured with SQUID.