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

Polymers

R࿍iger W. Seidel²  Richard Goddard¹  Bodo Zibrowius¹ 

[1] Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany; E-Mails:;Lehrstuhl für Analytische Chemie, Ruhr-Universität Bochum, Universitätstrasse 150, 44780 Bochum, Germany

关键词: coordination polymer;    crystal engineering;    crystal structure;    cadmium;    4;    4′-bipyridine;   

DOI  :  10.3390/polym3031458

来源: mdpi

【 摘 要 】

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(μ-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.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.