Synthesis and Characterization of Linear Trinuclear Pd, Co, and Pd/Co Pyrazolate Complexes

A family of dinuclear and linear trinuclear Co/Pd pyrazolate compounds, namely, [Bu 4 N] 2 [Co 2 (μ‐4‐Cl‐3,5‐Me 2 ‐pz) 2 Cl 4 ] ( 1 ), [Bu 4 N] 2 [Co 2 (μ‐4‐Br‐3,5‐Me 2 ‐pz) 2 Br 4 ] ( 2 ), [Bu 4 N] 2 [Co 2 (4‐I‐3,5‐Me 2 ‐pz) 2 Cl 4 ] ( 3 ), [Et 4 N] 2 [Pd 2 Co(4‐Br‐3,5‐Me 2 ‐pz) 4 Cl 4 ] ( 4 ), [Et 3 NH] 4 [PdCo 2 (4‐Br‐3,5‐Me 2 ‐pz) 4 Cl 4 ][NO 3 ] 2 ( 5 ), [Et 3 NH] 2 [Pd Co 2 (3‐Me‐5‐Ph‐pz) 4 Cl 4 ] ( 6 ), [Et 3 NH] 2 [Pd 3 (4‐Br‐3,5‐Me 2 ‐pz) 4 Cl 4 ] ( 7 ), and [Co 3 (3,5‐Me 2 ‐pz) 4 (3,5‐Me 2 ‐pzH) 2 (CH 3 CO 2 ) 2 ] ( 8 ) was synthesized. The single‐phase nature of the solids was established by single‐crystal X‐ray diffraction, thermal analysis, and spectroscopic techniques. Moreover, the magnetic behavior is studied and a magnetostructural comparison to the corresponding carboxylate analogues is made. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)