| Abstract |
Treatment of lead(II)acetate, Pb(CH3COO)(2) center dot 3H(2)O, with an isonicotinoylhydrazone building block (HL) and in the presence of two different salts (NaN3 or NaClO4)as a source of auxiliary ligand, resulted in two novel coordination compounds, namely a discrete 0D complex [Pb-4(mu(3)-L)(L)(mu-N-3)(N-3)][Pb(L)(N-3) (MeOH)] Alpha center dot 0.75MeOH (1)and a 2D coordination polymer [Pb(mu-L)(mu-CH3COO)Na(mu-ClO4)(MeOH)](n) (2), respectively. A related reaction of Pb(NO3)(2) with HL afforded a different product [Pb(mu-L)(NO3](n) (3), which is a 1D coordination polymer. All compounds were isolated in good yields as air-stable solids and were fully characterized by elemental analysis, FTIR spectroscopy, single crystal X-ray diffraction, topological analysis, and theoretical calculations. An interesting feature of all structures 1-3 concerns the hemi-directional coordination of Pb(II)atoms and the observation of tetrel bonds [noncovalent Pb center dot center dot center dot N/O interactions], which were analyzed in detail by DFT calculations and Hirshfeld surface analysis. In fact, tetrel bonding interactions are responsible for the extension [0D -> 2D (in 1)or 1D -> 2D (in 3)] or reinforcement [(2D -> 2D (in 2)] of the crystal structures, thus giving rise to intricate 2D supramolecular layers. After simplification, these layers were analyzed and classified from the topological perspective, disclosing binodal 3,5-connected underlying nets with the same 3,5L24 topology in 1 and 2 but being constructed from structurally distinct components, and a binodal 3,6-connected net with the 3,5L60 topology in 3. (C)2017 Elsevier B. V. All rights reserved. |
