Tetranuclear Pt2Cu2 Complex with a Staircase-Shaped Chain Aggregate in the Solid State |
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Authors: | Inmaculada Escorihuela Larry R. Falvello Milagros Tomás |
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Affiliation: | (1) University of Zaragoza, C. S. I. C., Zaragoza, Spain |
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Abstract: | The reaction of the tetranuclear cyanide aquo complex [{Pt(CN)4Cu(bipy)(H2O)}2]· 2H2O with aqueous ammonia produces the new tetranuclear ammino-containing product [{Pt(CN)4Cu(bipy)(NH3)}2] (1), with terminal cyanide groups and with NH3 coordinated to the Cu atom. The distorted trigonal bipyramidal coordination about copper in 1 differs from the square-pyramidal coordination present in the starting material. The bipyridine ligand in 1 is nearly perpendicular to the tetranuclear core of the molecule, as opposed to its coplanar disposition in the aquo complex. The two platinum atoms of the tetranuclear core in 1 form Pt···Pt interactions of 3. 2390(8) Å with platinum atoms of neighboring molecules, producing an echelon-shaped supramolecular chain held together by staggered (CN)4Pt···Pt(CN)4 linkages, an aggregate structure which does not have a precedent in chemistry derived from the Pt(CN)4 building block. |
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Keywords: | Non-covalent bonds Pt Cu cyanide bipy Pt· · · Pt interactions tetranuclear compounds |
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