Original scientific paper

The Structures of Four Complexes of 2,2,6,6-Tetramethyl-3,5- -heptanedione Containing One, Four, Four and Nine Cu(II) Ions

William H. Watson ; Department of Chemistry, Texas Christian University Fort Worth, Texas 76129 USA
Woodrow W. Holley ; Department of Chemistry, Texas Christian University Fort Worth, Texas 76129 USA

Abstract

The structures of bis-(2,2,6,6-tetramethyl-3,5-heptanedionato)
Cu(II) 1, di-fts-methoxy-di-μ-methoxy-tetrakis [ (2,2,6,6-tetramethy 1 ~
-3,5-heptanedionato)Cu(II)] 2, μ4-oxa-bispyrazolatotetrakis[(2,2,6,6-
-tetramethyl-3,6-heptanedionato)Cu(II)] 3, and hexa-μ3-hydroxy-
-μ6-(hydrogendioxo-0,0')-nonakis[(2,2,6,6-tetramethyl-3,5-heptanedionctto)
Cu(II)] 4 were determined by X-ray diffraction techniques.
Compound 1 is a planar molecule with weak packing interactions
and high thermal motion due to the interactions between
the bulky t-butyl groups. The observed density is only 1.14 Mgm-s.
Compound 2 is a step tetramer concenptually derived from squareplanardimers in which the axial site of one Cu(II) ion in each
dimer is occupied by a bridging oxygen from an adjacent dimer.
Compound 3 has four Cu(II) ions tetrahedrally coordinated to a
central oxygen atom. Compound 4 has six Cu(II) ions occupying
the corners of a trigonal prism and three lying above the rectangular
faces. Six hydroxyl ions each coordinate three Cu(II) ions,
one from each end of the prism and one from the face. In the
center is an (0-H ... Of3 unit which trigonally binds the Cu(II)
ions on each end of the prism. The bulky t-butyl groups in the
four complexes effectively isolate the central Cu(II) ions from
any intermolecular interactions.

Keywords

Hrčak ID:

194117

URI

https://hrcak.srce.hr/194117

Publication date:

20.10.1984.

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