A 3D chiral metal-organic framework based on left-handed helices containing 3-amino-1 H-1,2,4-triazole ligand

• Published in: Journal of solid state chemistry 2015-10, Vol.230, p.90-94
• Main Authors: Liu, Bing, Yang, Tian-Yi, Feng, Hui-Jun, Zhang, Zong-Hui, Xu, Ling
• Format: Article
• Language: English
• Subjects: 1,2,4-Triazole; AMINES; ANTIFERROMAGNETISM; CHIRALITY; COPPER COMPOUNDS; COPPER SULFATES; Crystal structure; DIFFUSION; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; LIGANDS; MAGNETIC MOMENTS; Metal-organic framework; MONOCRYSTALS; ORGANOMETALLIC COMPOUNDS; POROUS MATERIALS; POWDERS; SOLVENTS; THERMAL GRAVIMETRIC ANALYSIS; Topology; TRIAZOLES; TRIGONAL LATTICES; X-RAY DIFFRACTION
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2015.06.016

A chiral metal-organic framework, [Cu(atr)(OH)]·0.5H2O·0.5en (1) (Hatr=3-amino-1H-1,2,4-triazole, en=ethylenediamine), was constructed via diffusion reaction of the achiral Hatr ligand and CuSO4 as starting materials. Compound 1 crystallizes in the chiral space group P3221 and features a porous metal-organic framework with 44.1% solvent-accessible volume fabricated by left-handed helices with a pitch height of lp=10.442Å. Six helices gather around in a cycle forming a large honeycomb channel with a 6.58Å inner diameter. Cu(II) center and atr‒ ligand regarded as 3-connected nodes, compound 1 can be simplified to a 3-c uninodal {4.122} (qtz-h) topological network. A gradual decreasing in the magnetic moment depending on temperature decreasing indicates an antiferromagnetic interaction in 1. The powder XRD confirms the bulk sample is a single crystal pure phase, and the thermogravimetric analysis shows the thermal stability of 1 is up to ca. 240°C. [Display omitted] •The present 3D chiral MOF is built from achiral Hatr ligand.•Six left-handed helices gather into a honeycomb channel in chiral sp P3221.•Compound 1 shows a 3-c uninodal {4.122} or qtz-h topological network.•Compound 1 indicates an antiferromagnetic interaction.