Artificial Amino Acids in Nickel(II) and Nickel(II)/Lanthanide(III) Chemistry

作者：Peristeraki Tereza; Samios Marianna; Siczek Milosz; Lis Tadeusz; Milios Constantinos J^*

来源：Inorganic Chemistry, 2011, 50(11): 5175-5185.

DOI：10.1021/ic2004744

The synthesis and magnetic properties of five new homo- and heterometallic nickel(II) complexes containing artificial amino acids are reported: [Ni-4(aib)(3)(aibH)(3)(NO3)] (NO3)(4)center dot 3.05MeOH (1 center dot 3.05MeOH), [Ni6La(aib)(12)] (NO3)(3)center dot 5.5H(2)O (2 center dot 5"5H(2)O), [Ni6Pr(aib)(12)] (NO3)(3) center dot 5.5H(2)O (3 center dot 5.5H(2)O), [Ni-5(OH)(2)(L-aba)(4)(OAc)(4)]center dot 0.4EtOH center dot 0.3H(2)O 6(4 center dot 0.4EtOH(2)O.3H(2)O), and [Ni6La(L-aba)(12)][La-2(NO3)(9)] (5; aibH = 2-aminoisobutyric acid; L-abaH = L-2-aminobutyric acid). Complexes 1 and 4 describe trigonal-pyramidal and square-based pyramidal metallic clusters, respectively, while complexes 2, 3, and 5 can be considered to be metallocryptand-encapsulated lanthanides. Complexes 4 and 5 are chiral and crystallize in the space groups I222 and P2(1)3, respectively. Direct-current magnetic susceptibility studies in the 2-300 K range for all complexes reveal the presence of dominant antiferromagnetic exchange interactions, leading to small or diamagnetic ground states.

• 出版日期2011-6-6