| Abstract
| - The trinuclear complex(μ3-CO3)[Ni3(Medpt)3(NCS)4]was obtained by reaction of basic solutions ofnickel(II),Medpt (bis(3aminopropyl)methylamine) and thiocyanate ligandwith atmospheric CO2 or by simple reactionwithcarbonate anion.(μ3-CO3)[Ni3(Medpt)3(NCS)4]crystallizes in the triclinic system, space group P1̄,with a =12.107(5) Å, b = 12.535(7) Å, c =16.169(9) Å, α = 102.69(5)°, β = 92.91(5)°,γ = 118.01(4)°, Z = 2, andR= 0.043. The three nickel atoms are asymmetrically bridged byone pentadentate carbonato ligand, which showsa novel coordination mode. The(μ3-CO3)[Ni3(Medpt)3(NCS)4]compound shows a very strong antiferromagneticcoupling. Fit as irregular triangular arrangement gaveJ1 = −88.4, J2 =−57.7, and J3 = −9.6cm-1, which isthe strongest AF coupling observed to date for Ni3compounds. The magnetic behavior of the carbonatobridgeis discussed.
- A novel μ3pentadentate coordination mode for the carbonato bridging ligand hasbeen characterized in the trinuclear compound(μ3-CO3)[Ni3(Medpt)3(NCS)4].The strong antiferromagnetic behavior of the title compound hasbeen analyzed as a nonsymmetric triangular array of local S= 1. Magnetic trends for this new coordination mode arediscussed.
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