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Details van artikel 32 van 71 gevonden artikelen
| Titel: |
Structural investigations of copper(II) complexes containing unsymmetrical β-diketonate and monothio-β-diketonate ligands |
| Auteur: |
Delarosa, Mark J. Bousman, Kenneth S. Welch, John T. Toscano, Paul J. |
| Verschenen in: |
Journal of coordination chemistry |
| Paginering: | Jaargang 56 (2003) nr. 15 pagina's 1339-1349 |
| Jaar: |
2003-10-15 |
| Inhoud: |
The crystal structures of the complexes Cu(txhd)2 and Cu(S-tmhd)2 (where txhd is the anion of 2,2,6-trimethylheptane-3,5-dione and S-tmhd is the anion of 5-mercapto-2,2,6,6-tetramethyl-4-hepten-3-one) were determined. In the solid state, both complexes are square planar. In each case, only one geometrical isomer (trans or cis) was observed in the crystals; arguments are presented that both isomers are present in bulk samples of Cu(txhd)2, while from electronic considerations, the monothio-β-diketonate ligands probably have cis geometry in Cu(S-tmhd)2. Calculations of molecular volumes for structurally similar Cu[t-BuC(O)CHC(O)R]2 complexes showed that there is a slight decrease in packing efficiency as the steric bulk of R increases. More importantly, strong ring-stacking interactions, such as those found for Cu(acac)2 are not observed, or are greatly attenuated, in complexes with bulkier peripheral substituents. [Cu(txhd)(μ3-OEt)]4, an impurity that co-sublimed with Cu(txhd)2, was isolated in low yield. The tetrameric structure, which is isomorphous with known [Cu(tmhd)(μ3-OEt)]4 (where tmhd is the anion of 2,2,6,6-tetramethylheptane-3,5-dione), has a cubane-like core. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 32 van 71 gevonden artikelen
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