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Polymers 2011, 3(3), 1458-1474; doi:10.3390/polym3031458

A Molecular Antenna Coordination Polymer from Cadmium(II) and 4,4’-Bipyridine Featuring Three Distinct Polymer Strands in the Crystal

1
Lehrstuhl für Analytische Chemie, Ruhr-Universität Bochum, Universitätstrasse 150, 44780 Bochum, Germany
2
Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
3
Institut für Anorganische Chemie, Rheinisch-Westfälische Technische Hochschule Aachen, Landoltweg 1, 52074 Aachen, Germany
*
Author to whom correspondence should be addressed.
Received: 26 July 2011 / Revised: 18 August 2011 / Accepted: 31 August 2011 / Published: 5 September 2011
(This article belongs to the Special Issue Coordination Polymers)
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Abstract

Reaction of cadmium perchlorate and the prototypical linear bridging ligand 4,4’-bipyridine (4,4’-bipy) in an ethanol/water mixture affords the one-dimensional coordination polymer, [{Cd(m-4,4’-bipy)(4,4’-bipy)2(H2O)2}(ClO4)2 × 2 4,4’-bipy × 4.5 H2O]n (1). The Cd2+ ions adopt an octahedral coordination sphere and are joined into linear chains by 4,4’-bipy via two trans coordination sites. The remaining two trans sites in the equatorial plane carry terminally monodentate-bound 4,4’-bipy ligands, resulting in a molecular antenna arrangement. The two axial sites of each Cd2+ ion are occupied by aqua ligands. Compound 1 crystallizes in the non-centrosymmetric, monoclinic space group C2 with three similar, crystallographically independent, cationic coordination polymer strands in the unit cell, which essentially differ only in the conformations of the 4,4’-bipyridyl ligands. Consistent with the similarity of the local coordination environments of the three independent Cd atoms in the structure, 113Cd MAS NMR spectroscopy reveals a single resonance line at 89 ppm.
Keywords: coordination polymer; crystal engineering; crystal structure; cadmium; 4,4’-bipyridine coordination polymer; crystal engineering; crystal structure; cadmium; 4,4’-bipyridine
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Seidel, R.W.; Goddard, R.; Zibrowius, B.; Oppel, I.M. A Molecular Antenna Coordination Polymer from Cadmium(II) and 4,4’-Bipyridine Featuring Three Distinct Polymer Strands in the Crystal. Polymers 2011, 3, 1458-1474.

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