Abstract
The reaction of ligand 5,7-di-hydro-1H,3H-dithieno[3,4-b:3',4'-e]pyrazine (L) with CuI lead to the formation of a three-dimensional coordination polymer, incorporating the well known [Cu x I x ] n staircase motif (x = 4). These polymer [Cu4I4] n chains are linked via the N and S atoms of the ligand to form the three-dimensional coordination polymer poly[(μ4-5,7-di-hydro-1H,3H-dithieno[3,4-b:3',4'-e]pyrazine-κ4 N:N':S:S')tetra-μ3-iodido-tetra-copper], [Cu4I4(C8H8N2S2)] n (I). The asymmetric unit is composed of half a ligand mol-ecule, with the pyrazine ring located about a center of symmetry, and two independent copper(I) atoms and two independent I- ions forming the staircase motif via centers of inversion symmetry. The framework is consolidated by C-H⋯I hydrogen bonds.
Highlights
The reaction of ligand 5,7-dihydro-1H,3H-dithieno[3,4-b:30,40-e]pyrazine (L) with CuI lead to the formation of a three-dimensional coordination polymer, incorporating the well known [CuxIx]n staircase motif (x = 4). These polymer [Cu4I4]n chains are linked via the N and S atoms of the ligand to form the threedimensional coordination polymer poly[(4-5,7-dihydro-1H,3H-dithieno[3,4b:30,40-e]pyrazine-4N:N0:S:S0)tetra-3-iodido-tetracopper], [Cu4I4(C8H8N2S2)]n (I)
The asymmetric unit is composed of half a ligand molecule, with the pyrazine ring located about a center of symmetry, and two independent copper(I) atoms and two independent IÀ ions forming the staircase motif via centers of inversion symmetry
We have recently shown that the reaction of the ligand 5,7-dihydro-1H,3H-dithieno[3,4b:30,40-e]pyrazine (L), with silver(I) nitrate leads to the formation of a two-dimensional coordination polymer, with the silver atom coordinating only to the S atoms of the ligand so forming chains
Summary
We have recently shown that the reaction of the ligand 5,7-dihydro-1H,3H-dithieno[3,4b:30,40-e]pyrazine (L), with silver(I) nitrate leads to the formation of a two-dimensional coordination polymer, with the silver atom coordinating only to the S atoms of the ligand so forming chains. The reaction of L with CuCl2 and CuBr2 lead to the formation of isostructural one-dimensional coordination polymers with the ligand coordinating to the copper atom via the N atoms only (Assoumatine & Stoeckli-Evans, 2020b). Atom S1 deviates by 0.5076 (14) Afrom the mean plane of the four C atoms (C1–C4) This is considerably more than in the silver(I) nitrate two-dimensional coordination polymer or the ligand itself (Assoumatine & Stoeckli-Evans, 2020a). In the former, the S atom deviates from the mean plane of the four C atoms by 0.170 (15) A , and in the latter by only 0.0256 (8) A.
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