Syntheses and characterizations of a series of novel Ln6Cu24 clusters with amino acids as ligands.
With glycine or L-alanine as ligands, a series of novel 3d-4f heterometallic Ln(6)Cu(24) clusters with the formulas of [Sm(6)Cu(24)(mu(3)-OH)(30)(Gly)(12)(Ac)(12)(ClO(4))(H(2)O)(16)].(ClO(4))(9).(OH)(2).(H(2)O)(31) (1) and [Ln(6)Cu(24)(mu(3)-OH)(30)(Ala)(12)(Ac)(6)(ClO(4))(H(2)O)(12)].(ClO(4))(10).(OH)(7).(H(2)O)(34) (2.Ln) (Ln = Tb, Gd, Sm, and La) were synthesized by self-assembly, among which 1 and 2.Tb were characterized by X-ray structure analysis. The metal skeleton of the clusters may be described as a huge [Ln(6)Cu(12)] octahedron (constructed with 6 Ln(III) ions located at the vertices and 12 inner Cu(II) ions located at the midpoints of the edges) connected by 12 additional Cu(II) ions (every 2 are connected to 1 Ln(III) vertex). The temperature dependence of the magnetic susceptibilities of 2.Ln was investigated and was found to vary with the central rare-earth ions. Impedance spectroscopic measurements of 2.Ln reveal that they are ionic conductors.
Zhang
Jian-Jun
JJ
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China.
Sheng
Tian-Lu
TL
Xia
Sheng-Qin
SQ
Leibeling
Guido
G
Meyer
Franc
F
Hu
Sheng-Min
SM
Fu
Rui-Biao
RB
Xiang
Sheng-Chang
SC
Wu
Xin-Tao
XT
D000409:Alanine / Q000737:chemistry*; D000596:Amino Acids / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D005998:Glycine / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008024:Ligands; D008674:Metals, Rare Earth / Q000737:chemistry*; D008968:Molecular Conformation; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry
D000596:Amino Acids; D008024:Ligands; D008674:Metals, Rare Earth; D009942:Organometallic Compounds; D003300:Copper; D000409:Alanine; D005998:Glycine