Cuprophilicity in Dicopper Complexes Supported by Formamidinates
Poster Number
3
Format
Poster Presentation
Faculty Mentor Name
Qinliang Zhao
Faculty Mentor Department
Chemistry
Abstract/Artist Statement
Dicopper complexes were synthesized through a transmetallation or a direct metallation route. Structural characterization demonstrated that the two copper(I) atoms in a planar eight-member ring were brought together by two formamidinate ligands. The CuI-CuI separation is about 2.5 Å, similar to the analogue Cu2((ptol) NCHNH(p-tol))2 (2.45 Å) in the literature.[1] It was not the metal-metal bonding, however, that caused the close distance between the two copper atoms. The valence electron configuration of a CuI atom is d10. It contains a fully occupied d-orbital; the number of metalmetal bonding and antibonding orbitals are equal. With a bond order of 0, no overlap can exist between the d-d orbitals of two CuI atoms in a complex molecule. No net metal-metal bond can form. Despite the supposed lack of bonding between two complexed CuI atoms, the CuI-CuI shortened distance can be attributed to a weak interaction between the two atoms, partially aided by the s orbital to the �� and ��* which facilitates the Cu-Cu interaction.[1], [2] The shorter than expected Cu-Cu separation may be contributed to a weak interaction, termed cuprophilicity. Cuprophilicity, like other metallophicity such as argentophilicity and aurophilicity, is a special interaction exhibited between closed shell Cu atoms. [1] Cotton, F. A,; Matusz, M.; Poli, R.; Feng, X. J. Am. Chem. SOC. 1988, 110, 1144. [2] Poblet; Josep- M.;Bénard, M. Chemical Communications Chem. Commun. 1998, 11, 1179-180.
Location
DeRosa University Center, Ballroom
Start Date
30-4-2016 1:30 AM
End Date
30-4-2016 3:30 PM
Cuprophilicity in Dicopper Complexes Supported by Formamidinates
DeRosa University Center, Ballroom
Dicopper complexes were synthesized through a transmetallation or a direct metallation route. Structural characterization demonstrated that the two copper(I) atoms in a planar eight-member ring were brought together by two formamidinate ligands. The CuI-CuI separation is about 2.5 Å, similar to the analogue Cu2((ptol) NCHNH(p-tol))2 (2.45 Å) in the literature.[1] It was not the metal-metal bonding, however, that caused the close distance between the two copper atoms. The valence electron configuration of a CuI atom is d10. It contains a fully occupied d-orbital; the number of metalmetal bonding and antibonding orbitals are equal. With a bond order of 0, no overlap can exist between the d-d orbitals of two CuI atoms in a complex molecule. No net metal-metal bond can form. Despite the supposed lack of bonding between two complexed CuI atoms, the CuI-CuI shortened distance can be attributed to a weak interaction between the two atoms, partially aided by the s orbital to the �� and ��* which facilitates the Cu-Cu interaction.[1], [2] The shorter than expected Cu-Cu separation may be contributed to a weak interaction, termed cuprophilicity. Cuprophilicity, like other metallophicity such as argentophilicity and aurophilicity, is a special interaction exhibited between closed shell Cu atoms. [1] Cotton, F. A,; Matusz, M.; Poli, R.; Feng, X. J. Am. Chem. SOC. 1988, 110, 1144. [2] Poblet; Josep- M.;Bénard, M. Chemical Communications Chem. Commun. 1998, 11, 1179-180.