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Paramagnetism of Tetranuclear Complexes between TCNX Ligands (TCNE, TCNQ, TCNB) and Four Pentaammineruthenium or Dicarbonyl(pentamethylcyclopentadienyl)manganese Fragments

Published inInorganic chemistry, vol. 32, no. 15, p. 3248-3252
Publication date1997
Abstract

The tetranuclear complexes {(μ4-TCNX)[Ru(NH3)5]4}(A)8 and (μ4-TCNX)[Mn(CO)2(C5Me5)]4 [A = PF6 or CF3SO3; TCNX = TCNE (tetracyanoethene), TCNQ (7,7,8,8-tetracyano-p-quinodimethane), or TCNB (1,2,4,5-tetracyanobenzene)] were studied by variable-temperature (2−300 K) SQUID susceptometry. Mono- and dinuclear species [(PhCN)Ru(NH3)5](PF6)2 (PhCN = benzonitrile) and {(μ-L)[Ru(NH3)5]2}(PF6)4 (L = 1,4-dicyanobenzene (terephthalodinitrile) or pyrazine) were also investigated for comparison and were found to be essentially diamagnetic. Despite the even electron count, both the ruthenium and manganese tetranuclear complexes are paramagnetic, albeit with different spin−spin exchange coupling patterns. The manganese systems are characterized by exchange-coupled S = 1 states at the individual metal centers, whereas the magnetic behavior of the tetranuclear ruthenium compounds results from an exchange-coupling interaction between two S = 1/2 sites, identified as RuIII/RuII mixed-valence pairs.

Citation (ISO format)
WALDHÖR, Eberhard et al. Paramagnetism of Tetranuclear Complexes between TCNX Ligands (TCNE, TCNQ, TCNB) and Four Pentaammineruthenium or Dicarbonyl(pentamethylcyclopentadienyl)manganese Fragments. In: Inorganic chemistry, 1997, vol. 32, n° 15, p. 3248–3252. doi: 10.1021/ic960998s
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ISSN of the journal1939-5175
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