Copper(I) Cyanide Networks: Synthesis, Structure, and Luminescence Behavior. Part 2. Piperazine Ligands and Hexamethylenetetramine Photoluminescence of 1-D Copper(I) Cyanide Chains: A Theoretical Description

Document Type


Publication Date

Summer 7-2-2008


A variety of photoluminescent, and in some cases thermochromic, metal-organic networks of CuCN were self-assembled in aqueous reactions with amine ligands: (CuCN)2(Pip) (1a), (CuCN)20(Pip)7 (1b), (CuCN)7(MePip)2 (2), (CuCN)2(Me2Pip) (3a), (CuCN)4(Me2Pip) (3b), (CuCN)7(EtPip)2 (4), (CuCN)4(Et2Pip) (5), (CuCN)3(BzPip)2 (6a), (CuCN)5(BzPip)2 (6b), (CuCN)7(BzPip)2 (6c), (CuCN)4(BzPip) (6d), (CuCN)2(Bz2Pip) (7), (CuCN)(Ph2CHPip) (8a), (CuCN)2(Ph2CHPip) (8b), (CuCN)3(HMTA)2 (9a), (CuCN)5(HMTA)2 (9b), and (CuCN)5(HMTA) (9c) (Pip = piperazine, MePip = N-methylpiperazine, Me2Pip = N,N´-dimethylpiperazine, EtPip = N-ethylpiperazine, Et2Pip = N,N´-diethylpiperazine, BzPip = N-benzylpiperazine, Bz2Pip = N,N´-dibenzylpiperazine, Ph2CHPip = N-(diphenylmethyl)piperazine, and HMTA = hexamethylenetetramine). New X-ray structures are reported for 1b, 2, 3b, 4, 5, 6a, 6d, 7, 8b, 9b, and 9c. An important structural theme is the formation of (6,3) (CuCN)2(piperazine) sheets with or without threading of independent CuCN chains. Strong luminescence at ambient temperature is observed for all but complexes 6 and 7. All luminescent compounds show a broad emission band in the blue region at about 450 nm attributable to metal-to-ligand charge transfer behavior based on the large Stokes shift between excitation and emission maxima. Complexes 3, 8, and 9 are thermochromic due to an additional lower energy emission band which is absent at 78 K.

Journal Title

Inorganic Chemistry







Publisher Statement

This document is the unedited author's version of a Submitted Work that was subsequently accepted for publication in Inorganic Chemistry, copyright © American Chemical Society after peer review. To access the final edited and published work see https://pubs.acs.org/doi/pdf/10.1021/ic8005184.

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