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    • Keywords


      Mercury(II) complex; Hg· · · 𝜋 interaction; asymmetric triazene; crystal structure.

    • Abstract


      In this work, the asymmetric ligands [1-(phenyl)-3-(2-nitro-4-methylphenyl)]triazene (1), [1-(4-methylphenyl)-3-(2-nitro-4-methylphenyl)]triazene (2), [1-(4-ethylphenyl)-3-(2-nitro-4-methylphenyl)]triazene (3) and [1-(4-ethoxyphenyl)-3-(2-nitro-4-methylphenyl)]triazene (4), were synthesized. The reaction of the ligand (3) with HgCl2 in methanol resulted in the formation of the [HgL2] complex, (5). All compounds were characterized by means of CHN analysis, FT-IR, 1H NMR, 13C NMR spectroscopy. In addition, the crystal structures of the ligands (2) to (4) were investigated by single crystal X-ray analysis. In the solid state, all ligands exhibited trans conformation about the –N=N– double bond. The HgII complex (5) crystallized in monoclinic system with 𝐶2/𝑐 space group. The triazene ligand was found to be deprotonated prior to coordination and acts as monodentate ligand. The HgII which lies on inversion center (site symmetry $\bar{1}$), is surrounded by two N atoms from L ligands forming a linear geometry. The other two Hg–N bonds are relatively longer and can only be regarded as weak secondary bonds. Also, Hg-𝜂3-arene 𝜋-interactions are present in this compound. Hydrogen bonds, 𝜋 · · · 𝜋 and C–H· · · 𝜋 stacking interactions help in the stabilization of the resulted frameworks. These C–H· · · 𝜋 edge-to-face interactions are present with H· · · 𝜋 distance of 3.00 Å.

    • Author Affiliations


      Mohammad Reza Melardi1 Fatemeh Baber Shamsi Mogoii1 Ayoob Babaii Sajirani1 Jafar Attar Gharamaleki2 Behrouz Notash3 Mohammad Kazem Rofouei2

      1. Department of Chemistry, Islamic Azad University, Karaj Branch, Karaj, Iran
      2. Faculty of Chemistry, Kharazmi University, Tehran, Iran
      3. Department of Chemistry, Shahid Beheshti University, G. C., Evin, Tehran 1983963113, Iran
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