Structures and magnetic properties of new trinuclear CoII, NiII, and CuII complexes with trimethylacetate and 1,1-cyclohexanediacetate

Synthesis, Crystal Structures and Magnetic Properties of a Linear Trinuclear Cu(II) Complex [Cu3(ClCH2COO)6(bpy)2] and a Dinuclear Complex [Cu2(bpy)2(μ‐OH)(μ‐OH2) (μ‐ClCH2COO)](ClO4)2

“…Four of the six chloroacetate ions function as syn–syn bridging ligands and the remaining two form monoatomic bridges between adjacent copper sites. In contrast, the trinuclear unit in [Cu 3 (bpy) 2 (piv) 2 (chda) 4 ] (pivH=pivolic acid, chdaH 2 =1,1‐cyclohexanediacetic acid) is formed by using two syn–syn bridges and four monoatomic bridges. The free carboxylic oxygen atoms in 1 are weakly coordinated to the terminal copper sites.…”

“…Trinuclear Cu(II) complexes with only carboxylate bridges are rare. A complex in which two monocarboxylate ions and two dicarboxylate ions link three Cu(II) ions was reported recently . However, to the best of our knowledge, no trinuclear structure with only monocarboxylate bridges have been reported for Cu(II) though such complexes are known for Mn,, Co,Zn and Cd .…”

“…The present study reports two examples of carboxylate bridged Cu(II) complexes along with magnetic studies and magnetostructural correlations: [Cu 3 (bpy) 2 ( μ ‐ClCH 2 COO) 6 ] ( 1 ) and [Cu 2 (bpy) 2 ( μ ‐OH)( μ ‐OH 2 )( μ ‐ClCH 2 COO)](ClO 4 ) 2 ( 2 ). Several trinuclear Cu(II) complexes containing carboxylate and another bridging anion around Cu(II) centres are known . Trinuclear Cu(II) complexes with only carboxylate bridges are rare.…”