Intramolecular binding of nitrogen bases to a cofacial binuclear copper(II) complex

Externally and Internally Functionalized Copper(II) β-Diketonate Molecular Squares

“…31−34 The new binding constants are larger than those we previously observed for σ-donating guests such as dabco and pyrazine with the binuclear host Cu 2 (nba) 2 . 35 Still, they are significantly smaller than values reported (>10 5 M −1 ) for binding of C 60 to other macrocyclic polynuclear metal complexes. 36−38 c. Adduct with C 70 (27).…”

Self-assembly of rectangles via building units bearing salen and oxazoline ligands

“…Synthesis of spacer-chelator (11) Our strategy for the synthesis of self-assembled supramolecules of molecular rectangles utilizes the building unit with two parallel coordination sites facing in the same direction. The synthesis of spacer-chelator, 11, followed many of the procedures described previously for analogous compounds [15,16].…”

“…Although the molecular rectangles were formed by several flexible binucleating ligands [10], the rigid building units such as 1, 2, and 3 provides a cavity of well-defined size and shape. The spacer, 1, incorporating two acetylacetonate or dithiocarbamate chelators was found by Maverick [11] and Beer [12] groups to give the Cu ++ cofacial complexes. Stang and co-workers [13] have described the self-assembly reactions of a molecular'clip', 4, as an efficient entry into the rectangular shape with the antracene framework (2).…”

Synthesis and crystal structures of copper(II) and silver(I) complexes of a semi-rigid bipyrazolyl ligand

“…The torsion angles are 36.17(57) and 37.60(64)°for C4-C8-C26-C22 and C30-C34-C52-C48, respectively, which are much less than that in free H 2 L (131.40°). A few similar rectangular dimetallomacrocycles based on various metals and ligands are also known in the literature [19][20][21][22][23].…”