Speaker
Description
Due to their vast applications monometallic coordination polymers (CPs) have increasingly attracted the interest of various fields over the last years.$^{[1]}$ We focus on using heterofunctional ligands to synthesize heterobimetallic CPs, combining the properties of two metals in one homogenous material.$^{[2]}$ Our stepwise approach includes the synthesis of a metalloligand and, afterwards, its crosslinking using a second metal cation. Herein we present this approach for the ligand (3-(1,3,5-trimethyl-4-1H-pyrazolyl)acetylacetone (HacacMePz) with its heterobimetallic coordination polymer containing Fe(III) and Hg(II).
The CP crystallizes as an acetonitrile solvate in the triclinic space group $P\bar{1}$ with Z = 2. The [Fe(acacMePz)$_3$] metalloligands are linked by {Hg$_2$(µ$_2$-Cl)Cl$_3$} moieties. While the coordination sphere around the Fe(III) ion is a rather regular octahedron, the two symmetry inequivalent Hg(II) ions adopt distorted tetrahedral coordination environments ($\tau_4$ = 0.82, 0.76).$^{[3]}$ Interestingly, only one chlorido ligand is bridging and the other three are bound to one Hg(II) ion. This connectivity leads to an one-dimensional CP with a ladder-like structure as seen in Figure 1. The polymer expands in [1 −1 1] direction without any meaningful interactions between adjacent chains.
References
[1] S. R. Batten, S. M. Neville, D. R. Turner, Coordination Polymers: Design, Analysis and Application, RSC Publishing, Cambridge, 2009.
[2] M. Kremer, U. Englert, Z. Kristallogr. 2018, 233, 437-452.
[3] A. W. Addison, T. N. Rao, J. Chem. Soc., Dalton Trans. 1984, 1349-1356.
