Download Synthesis and structural characterization of Cd(II)

25th Croatian meeting of chemists and chemical engineers, Poreč, 2017.
Synthesis and structural characterization of Cd(II) coordination polymers:
Supramolecular architectures stabilized by noncovalent interactions
Priprava i strukturna karakterizacija koordinacijskih polimera kadmija(II):
Nekovalentnim interakcijama stabilizirane supramolekulske arhitekture
Željka Soldin, Nina Popov, Mladen Borovina and Marijana Đaković
Department of Chemistry, Faculty of Science, Horvatovac 102a, Zagreb, Croatia
E-mail: [email protected]
Crystal engineering generally involves the design and synthesis of crystalline materials
with desired properties and functions. Properties of crystalline solids are related not only to
their composition but also to the manner in which building units are aligned and linked
together in the solid state. Investigations of supramolecular interactions on metal-containing
systems can therefore be divided into two pathways, (i) the study of assemblies primarily
composed of 0D building units which are mutually linked via non-covalent interactions (in
particular hydrogen and/or halogen bonds as the main crystal engineering tools), and (ii) the
study of assemblies that rely on both coordination bond (1D- or 2D-coordination polymers)
and much weaker and relatively reversible non-covalent interactions [1,2].
In order to investigate supramolecular assembles of solids composed of coordination
polymers here we synthesized a series of halide complexes of Cd(II) with halogen substituted
pyridine and pyrimidine ligands. Single crystal X-ray structure determination revealed
1D-coordination polymers comprised of halide-bridged Cd(II) octahedra (Fig. 1a). The building
units are assembled into supramolecular 3D frameworks via a combination of hydrogen and
halogen bonds (Fig. 1b). Structure-property correlations, particularly thermal stability and
elasticity, were investigated. Spectroscopic, thermal and structural data were accompanied
by detailed data mining.
(a)
(b)
Figure 1: CdBr2(5-Brpm)2 (5-Brpm = 5-bromopyrimidine): (a) 1D-coordination polymer; (b) supramolecular
structure formed by CH···N hydrogen bonds and Br···Br halogen bonds.
References
[1] L. Brammer, Chem. Soc. Rev. 33 (2004) 476-489.
[2] G. R. Desiraju, J. Chem. Sci. 122 (2010) 667-675.
Acknowledgment
This work has been fully supported by Croatian Science Foundation under the project UIP-11-2013-1809.