Influence of noncovalent intermolecular interactions on crystal packing: syntheses and crystal structures of three layered Zn(ii)/1,2,4-triazole/carboxylate coordination polymersElectronic supplementary information (ESI) available: Crystallographic data and graphics of 1–3; TGA plots of 1–3. CCDC reference numbers 717414–717416. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/b901445d

Three 2D layered zinc coordination polymers: Zn(trz)(HBDC) (1), Zn4(trz)4(4-FBA)4·(H2O)0.5(2) and Zn4(trz)4(4-CBA)4(3) (trz = 1,2,4-triazole, H2BDC = 1,3-benzenedicarboxylic acid, 4-HFBA = 4-fluorobenzoic acid and 4-HCBA = 4-chlorobenzoic acid) have been synthesized by hydrothermal reactions and characterized by IR, elemental analysis, TGA measurements and X-ray single-crystal analysis. Compounds 1–3have the same 2D layer constructed by zinc(ii) with trz and carboxylate. The main difference in the structure of the three compounds is the interactions between the layers. Compound 1shows unusual intermolecular hydrogen bonding and C–Oπ interactions, compound 2exhibits intermolecular hydrogen bonding and C–Fπ interactions, while compound 3only shows intermolecular C–Clπ interactions. It is found that the noncovalent intermolecular interactions have an influence on crystal packing. [ABSTRACT FROM AUTHOR]