%0 Journal Article %1 Waldhoer.1997 %A Waldhoer, Eberhard %A Kaim, Wolfgang %A Lawson, Max %A Jordanov, Jeanne. %D 1997 %J Inorganic Chemistry %K ammine complex complex;TCNB manganese paramagnetism paramagnetism;TCNE paramagnetism;TCNQ paramagnetism;methylcyclopentadienyl paramagnetism;paramagnetism ruthenium %N 15 %P 3248--3252 %R 10.1021/IC960998S %T Paramagnetism of Tetranuclear Complexes between TCNX Ligands (TCNE, TCNQ, TCNB) and Four Pentaammineruthenium or Dicarbonyl(pentamethylcyclopentadienyl)manganese Fragments %V 36 %X Tetranuclear (μ4-TCNX)[Ru(NH3)5]4(A)8 and (m4-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-temp. (2-300 K) SQUID susceptometry. Mono- and dinuclear [(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 studied for comparison and were essentially diamagnetic. Despite the even electron count, both the Ru and Mn tetranuclear complexes are paramagnetic, albeit with different spin-spin exchange coupling patterns. The Mn systems were characterized by exchange-coupled S = 1 states at the individual metal centers, whereas the magnetic behavior of the tetranuclear Ru compds. results from an exchange-coupling interaction between two S = 1/2 sites, identified as RuIII/RuII mixed-valence pairs. [on SciFinder(R)]

@article{Waldhoer.1997, abstract = {Tetranuclear {(μ4-TCNX)[Ru(NH3)5]4}(A)8 and (\textgreek{m}4-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-temp. (2-300 K) SQUID susceptometry. Mono- and dinuclear [(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 studied for comparison and were essentially diamagnetic. Despite the even electron count, both the Ru and Mn tetranuclear complexes are paramagnetic, albeit with different spin-spin exchange coupling patterns. The Mn systems were characterized by exchange-coupled S = 1 states at the individual metal centers, whereas the magnetic behavior of the tetranuclear Ru compds. results from an exchange-coupling interaction between two S = 1/2 sites, identified as RuIII/RuII mixed-valence pairs. [on SciFinder(R)]}, added-at = {2022-06-15T11:26:56.000+0200}, author = {Waldhoer, Eberhard and Kaim, Wolfgang and Lawson, Max and Jordanov, Jeanne.}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2684231b41f98d53f5941459b10e139b3/huebleriac}, doi = {10.1021/IC960998S}, interhash = {a8bdb9d5c8b9088c3a82b11952d801f1}, intrahash = {684231b41f98d53f5941459b10e139b3}, issn = {0020-1669}, journal = {Inorganic Chemistry}, keywords = {ammine complex complex;TCNB manganese paramagnetism paramagnetism;TCNE paramagnetism;TCNQ paramagnetism;methylcyclopentadienyl paramagnetism;paramagnetism ruthenium}, number = 15, pages = {3248--3252}, timestamp = {2022-06-15T09:26:56.000+0200}, title = {Paramagnetism of Tetranuclear Complexes between TCNX Ligands (TCNE, TCNQ, TCNB) and Four Pentaammineruthenium or Dicarbonyl(pentamethylcyclopentadienyl)manganese Fragments}, volume = 36, year = 1997 }