Metal Organic Frameworks (MOFs) with Copper Based Building Units available now

Metal Organic Frameworks (MOFs) with Copper Based Building Units available now

blog_53 MOF

Copper Iodide and Copper Cyanide MOFs used in Photophysical Applications

 

Metal-Organic Frameworks MOFs are highly porous materials with well-defined, 3-D ordered structures.   Due to their structural and functional tunability, these advanced materials have widespread applications in gas storage and separation, catalysis, optics, and many others.

 Copper (I) iodide is a p-type semiconductor having a band gap of about 3.1 eV.  The product can be used for photophysical applications.  The CuI based MOF, Bis(N,N’-dimethylpiperazine)tetra[copper(I) iodide] (29-0550) CAS 1401708-91-5, has also attracted attention. This product consists of (CuI)4 nodes with bridging N,N′-dimethylpiperazine ligands1.

Product 29-3015 CAS Number: 928170-42-7  Bis(1,4-diazabicyclo[2.2.2]octane)tetra(copper(I) iodide) (CuI)4(DABCO)2, is also a Cu4I4 cluster, but it is linked with the bi-functional DABCO ligand. The product displays bright luminescence both at room temperature and at 77 K.

Another copper MOF, (Hexamethylenetetramine)penta[copper(I) cyanide] (29-0565)3 CAS1042093-98-0 also displays interesting luminescence behaviour.  This copper complex is a 3D photo luminescent, very densely-packed, network of tetradentate ligands.

Luminescence of (CuCN)5(HMTA):)a) spectra at 298, 77 and 4 K; (b) photos (left to right) room light/298 K, UV light/298 K, UV light/77 K.

Having both high and low energy bands, 29-0565 displays luminescence, of varying intensity, ranging from green to orange at ambient temperatures (see image).  The  l max excitation range is 282 and 304 nm, and the l max emission range is 417 to 522nm.

References:

  1. J. P. Sake. Network formation and photoluminescence in copper(I) halide complexes with substituted piperazine ligands. Dalton Trans., 2012, 41, 11663.
  2. D. Braga et al. Reversible Interconversion between Luminescent Isomeric Metal–Organic Frameworks of [Cu4I4(DABCO)2] (DABCO=1,4-Diazabicyclo[2.2.2]octane). Chem. Eur. J., 2010, 16, 1553 – 1559
  3. M. J. Lim. Copper(I) Cyanide Networks: Synthesis, Structure, and Luminescence Behavior. Part 2. Piperazine Ligands and Hexamethylenetetramine. Inorg. Chem., 2008, 47, 6931