Two-Dimensional Supramolecular from the Self-Assembly of Dissymmetrical Oxamidato-Bridged Heterometallic Trinuclear Building Blocks: Synthesis, Crystal Structure, and Magnetic Properties

[μ3-cis-N-(2-Aminoethyl)-N′-(2-carboxylatophenyl)oxamidato(3−)]bis(2,2′-diamino-4,4′-bi-1,3-thiazole)tetracopper(II) bis(2,4,6-trinitrophenolate)

“…All reagents were of analytical reagent grade. Na[Cu(oxbe)] was prepared according to the method of Tao, Zang, Mei et al (2003). For the preparation of the title complex, [Cu 4 (oxbe) 2 (dabt) 2 ](pic) 2 , (II), a methanolic solution (5 ml) of Cu(pic) 2 Á6H 2 O (0.0628 g, 0.1 mmol) was added dropwise to an aqueous solution (5 ml) of Na[Cu(oxbe)] (0.0335 g, 0.1 mmol) with continuous stirring.…”

“…Compared with studies dealing with symmetric N,N 0 -disubstituted oxamide polynuclear systems (Nakatani et al, 1991;Lloret et al, 1992;Santana et al, 2004;Tang et al, 2005), relatively few studies of asymmetric N,N 0 -disubstituted oxamide polynuclear complexes have been reported to date, owing to difficulties in their synthesis (Matović et al, 2005;Zang et al, 2003). However, polynuclear complexes bridged by asymmetric N,N 0 -disubstituted oxamide ligands containing aromatic groups are characterized by connecting into a threedimensional supramolecular structure via hydrogen bonds and stacking, while they have shown outstanding magnetic properties (Yu et al, 1989(Yu et al, , 1991Larionova et al, 1997;Tao, Zang, Mei et al, 2003;Tao et al, 2004;Matović et al, 2005;Zhu et al, 2007), which prompted us to design and synthesize this type of polynuclear complex to explore their particular structures and functionalities.…”

Bis[μ3-cis-N-(2-aminopropyl)-N′-(2-carboxylatophenyl)oxamidato(3–)]bis(2,2′-bipyridine)dichloridotetracopper(II) dihydrate

“…All reagents were of analytical reagent grade and were used without further purification. A methanol (5 ml) solution of CuCl 2 Á2H 2 O (0.0085 g, 0.05 mmol) was added dropwise to an aqueous solution (5 ml) of Na[Cu(oxbm)] (0.0349 g, 0.1 mmol), prepared according to the method described by Tao et al (2003), with continuous stirring. The mixture was stirred quickly for an hour and then a solution of 2,2 0 -bipyridine (0.0078 g, 0.05 mmol) in methanol (5 ml) was added dropwise.…”

(3-{[N-(5-Chloro-2-hydroxyphenyl)oxamoyl]amino}propyl)dimethylazanium perchlorate

“…The ligand, H 3 chdpoxd, was prepared according to the method proposed by Tao et al, (2003). To a solution of H 3 chdpoxd (0.0299 g, 0.1 mmol) in methanol (10 ml) were added sequentially piperidine (0.2 mmol) and a solution of Cu(ClO 4 ) 2 .6H 2 O (0.0742 g, 0.2 mmol) in methanol (10 ml).…”