title: An oscillating C2(2-) unit inside a copper rectangle.
abstract: [Cu4(mu-dppm)4(mu4-eta1,eta2-C[triple bond]C-)]2+ has been shown by 31P and 1H NMR studies to undergo two fluxional processes in solution, the oscillation of the C[triple bond]C2- unit inside the copper rectangle and the flipping of the diphosphines, and this has been supported by DFT(B3LYP) calculations.
authors.affiliation: Centre for Carbon-Rich Molecular and Nano-Scale Metal-Based Materials Research, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, People's Republic of China.
authors.forename: Wing-Yin
authors.initials: WY
authors.lastname: Lo
authors.forename: Chi-Ho
authors.initials: CH
authors.lastname: Lam
authors.forename: Wendy Kit-Mai
authors.initials: WK
authors.lastname: Fung
authors.forename: Hong-Zhe
authors.initials: HZ
authors.lastname: Sun
authors.forename: Vivian Wing-Wah
authors.initials: VW
authors.lastname: Yam
authors.forename: David
authors.initials: D
authors.lastname: Balcells
authors.forename: Feliu
authors.initials: F
authors.lastname: Maseras
authors.forename: Odile
authors.initials: O
authors.lastname: Eisenstein