IRMACS: The Interdisciplinary Colloquium "Ancient Metals in Advanced Materials: Cyanide-based Coordination Polymers"

Friday, February 1, 2013
11:30 - 12:30

Dr. Daniel B. Leznoff
Department of Chemistry, SFU


The rational increase of structural dimensionality is an important synthetic goal in supramolecular systems. The Leznoff group has been incorporating paramagnetic and diamagnetic metals and non-octahedral cyanometallates into polymers, targeting magnetic, vapochromic, birefringent, luminescent, high dielectric, negative-thermal expansion and other properties. In particular, neglected linear d10 [M(CN)2]- building blocks (M=Au,Ag) have been targeted to take advantage of attractive metallophilic interactions to increase structural dimensionality. Several property-based vignettes from this work will be presented in this lecture. For example, simple "mineral-like" cyanoaurate(I)-based polymers of the form M[Au(CN)2]2(H2O)x with unusual magnetic and vapochromic properties (M=Cu-Mn) will be profiled. The use of luminescent Zn[Au(CN)2]2 as an ammonia sensor and methods to prepare thin-films of this insoluble material will be discussed. As a comparison with the linear [Au(CN)2]- unit, coordination polymers with the square-planar d8 [Au(CN)2Br2]- building blocks and their rare reductive elimination properties will also be described. The use of these soluble Au(III)-based polymers as photolithography substrates will be described, thereby opening a new route to processibility of coordination polymers for materials applications. A new direction in our lab (funded by the NSERC-DAS), targeting redox-active metal-phthalocyanine materials, will briefly be outlined.

Refs: Chem. Soc. Rev., 2008, 37, 1884; J. Am. Chem. Soc., 2008, 130, 10662; Inorg. Chem., 2010, 49, 9609; Dalton Trans., 2011, 40, 4140; Chem. Eur. J., 2012, 12404.