Document Type
Article
Publication Date
8-17-2015
Abstract
© 2015 American Chemical Society. Five functionalized bis(β-diketones) and their Cu(II) molecular squares are described. The new bis(β-diketones), m-pbhxH2 (3), 5-MeO-m-pbaH2 (4), 5-BuO-m-pbaH2 (5), 2-MeO-m-pbaH2 (6), and 2-MeO-m-pbprH2 (7), were prepared by reaction of the corresponding aldehydes with phospholenes, as we previously reported for m-pbaH2 (1) and m-pbprH2 (2). Ligand 3 has long alkyl chains in its β-diketone moieties, while ligands 4-7 have alkoxy substituents on their aromatic rings. When treated with Cu2+, the new bis(β-diketones) 3, 4, 5, and 7 afford molecular squares, Cu4(m-pbhx)4 (10), Cu4(5-MeO-m-pba)4 (11), Cu4(5-BuO-m-pba)4 (12), and Cu4(2-MeO-m-pbpr)4 (13), respectively. Two of the new molecular squares, 10 and 12, contain longer-chain substituents and are soluble in a wider range of organic solvents. The other squares, 11 and 13, contain external and internal methoxy groups, respectively, and they show smaller changes in solubility. Single-crystal X-ray analyses are reported for three of the molecular squares without guest molecules, and for five adducts of the squares with σ- (polypyridine) and π-bonded (fullerene) guests. The Cu⋯Cu distances in the "empty" squares range from 14.047 to 14.904 Å; those in the adducts vary over a wider range depending on the guest molecule involved. (Chemical Equation Presented).
Publication Source (Journal or Book title)
Inorganic Chemistry
First Page
7791
Last Page
7802
Recommended Citation
Cherutoi, J., Sandifer, J., Pokharel, U., Fronczek, F., Pakhomova, S., & Maverick, A. (2015). Externally and Internally Functionalized Copper(II) β-Diketonate Molecular Squares. Inorganic Chemistry, 54 (16), 7791-7802. https://doi.org/10.1021/acs.inorgchem.5b00792
