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![[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
Published on: May 21, 2019
Anion···π interactions in copper(I) chloride and bromide coordination polymers bearing 1,4-bis(pyridazin-4-yl)benzene
Anna S Degtyarenko1, Konstantin V Domasevitch1
1Inorganic Chemistry Department, National Taras Shevchenko University of Kyiv, Volodymyrska Street 64/13, 01601 Kyiv, Ukraine.
Abstract:
In poly[[μ4-1,4-bis(pyridazin-4-yl)benzene-1:2:3:4κ(4)N(1):N(2):N(1'):N(2')]di-μ2-chlorido-dicopper(I)], [Cu2Cl2(C14H10N4)]n, (I), and its isomorphous bromide analogue, [Cu2Br2(C14H10N4)]n, (II), the organic ligand is situated across a centre of inversion. The Cu(I) cations adopt a distorted tetrahedral [CuN2X2] [X = Cl in (I) or Br in (II)] environment [Cu-N = 2.0183 (14)-2.0936 (14) Å; Cu-Cl = 2.2686 (6) and 2.4241 (5) Å; Cu-Br = 2.4002 (6) and 2.5284 (5) Å] and the primary coordination motif consists of cuprohalogenide chains accommodating μ-pyridazine groups. The organic ligands are tetradentate and link the inorganic chains into corrugated layers. Their packing is influenced by interlayer anion···π interactions [Cl···π = 3.540 (2) Å and Br···π = 3.593 (2) Å] with the electron-deficient pyridazine rings. This kind of interaction precludes the characteristic slipped π-π stacking and close parallel alignment of the organic tectons; it may be involved as a structure-defining factor for coordination layers based upon lengthy polyaromatic linkers.
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