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.
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China.
Jian-Jun
JJ
Zhang
Tian-Lu
TL
Sheng
Sheng-Qin
SQ
Xia
Guido
G
Leibeling
Franc
F
Meyer
Sheng-Min
SM
Hu
Rui-Biao
RB
Fu
Sheng-Chang
SC
Xiang
Xin-Tao
XT
Wu
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