0000000000303128
AUTHOR
J. Hefner
Unprecedented multistability in dodecanuclear complex compound observed by Mössbauer spectroscopy
Abstract The precursors [Fe(III)( 5X L)Cl] ( 5X LH 2 = N , N ′-bis(1-hydroxy-2-benzyliden)-1,6-diamino-3-X-hexane, X = N,S) are high-spin ( S = 5/2) complexes. This precursors are combined with the bridging unit [(NC) 5 Fe(II)-CN-Co(III)(CN) 5 ] 6− to yield star-shaped dodecanuclear clusters, [( 5X LFe(III)-NC) 5 Fe(II)-CN-Co(III)(CN-Fe(III) 5X L) 5 ]Cl 4 . The star-shaped compounds are high-spin systems at room temperature. On cooling to 20 K some of the iron(III) centers in the N-star switch to the low-spin state as proven by Mossbauer spectroscopy, i.e. multiple electronic transitions, while the S-star remains in the high-spin state.
Heptanuclear high-spin complex compounds based on S-donors
Abstract The precursors [Fe(III)( SY L)Cl] ( SY LH 2 ) = N , N ′-bis(1-hydroxy-Y-2-benzyliden)-1,6-diamino-3-thiohexane, (Y = H, 3EtO, 5Me) are high-spin ( S = 5/2) complexes. The precursors are combined with [Fe(II)(CN) 6 ] 4− and [Co(III)(CN) 6 ] 3− to yield star-shaped heptanuclear clusters, [Fe(II)(CN–Fe(III) SY L) 6 ]Cl 2 and [Co(III)(CN–Fe(III) SY L) 6 ]Cl 3 . The star-shaped compounds are high-spin (HS) systems at room temperature. On cooling to 20 K some of the iron(III) centers perform some HS–HS transition.