SOLVOTHERMAL SYNTHESES, CRYSTAL STRUCTURE, AND PHOTOLUMINESCENT PROPERTIES OF TWO Cu(I) COORDINATION POLYMERS CONSTRUCTED BY BISIMIDAZOLE LIGANDS
Two Cu(I) coordination polymers {[Cu2(bibp)2]?bdc?3H2O}n (1) and {[Cu3(bib)3]?btc?5H2O}n (2), where bibp = 4,4c-bis(1-imidazol-1-yl)biphenyl, H2bdc = terephthalic acid, bib = 1,4-bis(1imidazol-1-yl)benzene, H3btc = benzene-1,3,5-tricarboxylic acid, are synthesized under solvothermal conditions and characterized structurally. Complex 1 crystallizes in the triclinic form with the space group P-1, and Cu(1) is two-coordinated by two N atoms of bibp, Cu(2) is three coordinated from two N atoms of bibp and one water molecule. Complex 2 crystallizes in the triclinic form with the space group P-1; the copper ions are monovalent and twocoordinated by two N atoms of bib. The bdc and btc ligands are not coordinated with Cu ions, but play important roles in the generation of a 3D supramolecular structure of complexes 1 and 2 via weak interactions respectively.
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Complex 1 crystallizes in the triclinic
form with the space group P-1, and Cu(1) is two-coordinated by two N atoms of bibp, Cu(2) is
three coordinated from two N atoms of bibp and one water molecule. <...> Complex 2 crystallizes in
the triclinic form with the space group P-1; the copper ions are monovalent and twocoordinated
by two N atoms of bib. <...> The bdc and btc ligands are not coordinated with Cu ions,
but play important roles in the generation of a 3D supramolecular structure of complexes 1 and
2 via weak interactions respectively. <...> Supramolecular architectures constructed via coordination bonds or weak interactions have
achieved remarkable attention in recent years due to not only their intriguing structure, but also their
potential application in gas sorption, ion exchange, magnetism, catalysis, etc. [ 1—4]. <...> The choice of metal
ions with various coordination geometry and ligands with different binding preference is generally of
primary considerations [ 5—8]. <...> The divalent copper ion is usually chosen as a center ion because its
coordination number could vary from four to six, and it is easily deoxidized to monovalent copper ions
under hydro(solvo)thermal synthesis conditions [ 9—11]. <...> On the basis of these considerations, we selected divalent copper ions, terephthalic acid
(H2bdc), benzene-1,3,5-tricarboxylic acid (H3btc), 1,4-bis(1-imidazol-1-yl)benzene (bib), and 4,4bis(1-imidazol-1-yl)biphenyl
(bibp) as
building
blocks. <...> As shown in Fig. 1, the asymmetric unit consists of two Cu atoms, two bibp, one bdc, and three water molecules. <...> Cu(1) is two-coordinated by two N atoms from two different bibp forming a linear coordination geometry. <...> The Cu(1)—N distances are 1.895(3) Е and 1.897(3) Е, which are compared with the reported Cu—N length in Cu(I) coordination compounds [ 20 ], and the Cu(1)—O(3) distance is 2.870 Е; such a weak Cu—O interaction is observed in Cu(I) coordination polymers containing polyoxometalate ligands [ 21, 22 ]. <...> The Cu(2) atom adopts a T-shaped coordination geometry; it is coordinated with two N atoms of two different bibp and one water molecule <...>
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