1709-25-7Relevant articles and documents
The construction of open GdIII metal-organic frameworks based on methanetriacetic acid: New objects with an old ligand
Canadillas-Delgado, Laura,Martin, Tomas,Fabelo, Oscar,Pasan, Jorge,Delgado, Fernando S.,Lloret, Francesc,Julve, Miguel,Ruiz-Perez, Catalina
, p. 4037 - 4047 (2010)
The preparation, X-ray crystallography and magnetic investigation of the first examples of methanetriacetate (mta)-containing lanthanide(III) complexes of formulae [Gd(mta)(H2O)3]n4nH2O (1) [Gd(mta)(H2O)3]n.2nH2O (2) and [Gd2(mta)2(H2O)2] n.2nH2O (3) are described herein. This tripodal ligand promotes the formation of 63 networks; thus 1 consists of a honeycomb structure, whereas in 2 two of these layers are condensed to form a rare five-connected two-dimensional (4862) network. Compound 3 can be seen as an aggregation of 63 layers leading to a three-dimensional (6,6)-connected binodal (41263)(4 966)-nia net, in which the gadolinium(III) ions and the mta ligands act as octahedral and as trigonal prismatic nodes, respectively. The magnetic properties of 1-3 were investigated in the temperature range 1.9-300 K. A close fit to the Curie law (1) and weak either antiferro- [J= -0.0063(1) cm-1(2)] or ferromagnetic [J=.+ 0.0264(6) cm-1 (3)] interactions between the GdIII ions are observed; the different exchange pathways involved [extended tris-bidentate mta (1) and μ-O(1 );K2O(1),O(2) (2 and 3) plus single syn-syn carboxylate-mta (3)] accounting for these magnetic features. The nature and magnitude of the magnetic interactions, between the GdIII ions in 1-3, agree with the small amount of data existing in the literature for these kind of bridges.
Tandem radical reactions of isonitriles with 2-pyridonyl and other aryl radicals: Scope and limitations, and a first generation synthesis of (±)-camptothecin
Curran, Dennis P.,Liu, Hui,Josien, Hubert,Ko, Sung-Bo
, p. 11385 - 11404 (2007/10/03)
Photolysis of N-propargyl-6-halo-2-pyridones and related aromatic halides in the presence of aryl isonitriles provides tetra- and penta-cyclic products in a single step by a sequence of radical addition to the isonitrile followed by two cyclizations. The scope and limitations of the process are described along with a first generation synthesis of racemic camptothecin.
