Synthesis and structural characterization of new copper complexes and the copper-barium-alkoxide complex BaCu[sub 4](OC(R)C(H)C(R)O)[sub 4](OR[prime])[sub 2](HOR[prime])[sub 4] (R = C(CH[sub 3])[sub 3], R[prime] = CH[sub 2]CH[sub 2]OCH[sub 3])
- Univ. of Zuerich (Switzerland)
A series of new copper complexes [(thd)Cu(OMe)][sub 4] (4), [(tfd)Cu(OMe)][sub 4] (5) [(hfd)Cu(OMe)][sub 4] (6), [(thd)Cu(OPr[sup i])][sub 2] (7), [(tfd)Cu(OPr[sup i])][sub 2] (8), [(thd)Cu(OPh[sub f])][sub 2] (9), [(tfd)Cu(OPh[sub f])][sub 2] (10) [(hfd)Cu(OPh[sub f])] [sub 2] (11), [(thd)Cu(OCH[sub 2]CH[sub 2]OMe)][sub 4] (12), [(tfd)Cu(OCH[sub 2]CH[sub 2]OMe)][sub 4] (13), and [(hfd)Cu(OCH[sub 2]CH[sub 2]OMe)][sub 4] (14) (where thd, tfd, and hfd are the 2,2,6,6-tetramethyl-3,5-heptanedionato-,1,1,1-trifluoro-2,4-pentanedionato-, and 1,1,1,5,5,5-hexafluoro-2,4-pentanedionato ligands, respectively) were synthesized by using a [beta]-diketonate/alkoxide exchange method. Compounds 6, 10, 12, 14 were characterized by single-crystal X-ray diffraction. 6 and 10 exist as labile THF adducts with four and two THF molecules coordinated to the Cu atoms, respectively. Complex 10 has a centrosymmetric dimeric structure, and complexes 6 and 14 (crystallographic D[sub 2] and C[sub 2] symmetry, respectively) represent a cubane-type tetranuclear structure, in which four expanded parallel Cu[center dot][center dot][center dot]O bonds are observed. Complex 12 (C[sub i] symmetry) also contains a tetranuclear unit but belongs to a group of ladderlike structures with two stronger and two weaker Cu[center dot][center dot][center dot]O contacts. Starting from 12, the mixed-metal complex 15 was obtained, which was characterized by X-ray single crystal diffractometry. Complex 15 contains one Ba and four Cu atoms and has approximate C[sub 2] symmetry. A unifying approach was applied for the description of the frameworks of 15, the related Ba, Cu complex 18, and the high-[Tc] superconductor 19 in terms of common elementary building blocks. 25 refs., 9 figs., 16 tabs.
- OSTI ID:
- 7072032
- Journal Information:
- Inorganic Chemistry; (United States), Vol. 31:26; ISSN 0020-1669
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALKOXIDES
CRYSTAL STRUCTURE
BARIUM COMPOUNDS
COPPER COMPOUNDS
CHEMICAL PREPARATION
HIGH-TC SUPERCONDUCTORS
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
COHERENT SCATTERING
DIFFRACTION
SCATTERING
SUPERCONDUCTORS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
360602* - Other Materials- Structure & Phase Studies