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Dibromo and Diiodo-Bridged Dicopper(I,I) Complexes of 1,8-Naphthyridine-2,7-Di(N-cyclohexyl)methanimine

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Abstract

The synthesis and structures of two dicopper(I,I)-1,8-naphthyridine-2,7-diimine “crescent” complexes are presented. The four nearly coplanar nitrogen atoms of the crescent—two from naphthyridine and two from imines—house the dicopper(I,I) centers, which are bridged by two bromide ligands (1a) or two iodide ligands (1b) folded down from the copper–copper direction. The copper(I)-copper(I) distances are short and comparable (ca. 2.686 Å for 1a and ca. 2.620 Å for 1b). Each complex crystallizes in the triclinic space group P − 1 (#2): 1a as the acetonitrile solvate C22H28Cu2Br2N4.C2H3N has unit cell parameters a = 8.8941(10) Å, b = 9.0228(11) Å, c = 16.5475(16) Å, α = 95.956(6)°, β = 90.198(6)°, γ = 101.446(6)°, volume 1294.1(2) Å3, Z = 2; 1b as the acetonitrile solvate C22H28Cu2I2N4. 2C2H3N has unit cell parameters a = 11.6960(10) Å, b = 12.2839(11) Å, c = 12.5819(11) Å, α = 75.508(4)°, β = 65.947(5)°, γ = 64.910 (5)°, volume 1488.4(2) Å3, Z = 2. The complexes display long-lived stability (years) in the solid state.

Graphical Abstract

The syntheses and structural characterizations of dibromo-bridged and diiodo-bridged dicopper(I,I)-1,8-naphthyridine-2,7-di(N-cyclohexyl)methanimine crescent complexes are presented.

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Authors and Affiliations

  1. DRT Strategies, Inc., 4401 North Fairfax Drive, Suite 800, Arlington, VA, 22203, USA

    Erica D. Boehm

  2. Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803-1804, USA

    Frank R. Fronczek

  3. School of Mathematical and Physical Sciences, University of New England, Biddeford, ME, 04005, USA

    Stephen Fox

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  1. Erica D. Boehm
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  2. Frank R. Fronczek
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  3. Stephen Fox
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Boehm, E.D., Fronczek, F.R. & Fox, S. Dibromo and Diiodo-Bridged Dicopper(I,I) Complexes of 1,8-Naphthyridine-2,7-Di(N-cyclohexyl)methanimine. J Chem Crystallogr 52, 485–493 (2022). https://doi.org/10.1007/s10870-022-00920-w

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