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Abstract:In this work, the reaction of 2,2′,2″-nitrilotriethanol (NTE) with a 1:1 mixture of CdI 2 and HgI 2 is investigated. The complex [Cd(NTE) 2 ][Hg 2 (μ-I) 2 I 4 ] was synthesized and identified by elemental analysis, FT-IR, 1 H NMR spectroscopy and single-crystal X-ray diffraction. The structure of the [HNTE]Cl salt is also presented. In the crystal structure of the complex, the cadmium atom has a CdN 2 O 6 environment in a slightly distorted cube geometry. This geometry is one of the rare cube geometries with a minimum distortion among the Cambridge Structural Database structures for cadmium complexes. The anionic moiety has a binuclear structure with the mercury atoms being in tetrahedral environments. In the network of the complex, in addition to O−H · · · I hydrogen bonds, there are I · · · I interactions which lead to ten-membered rings.

In this work, two binuclear complexes, fac-[Cd2(AEPC)2(μ-Cl)2Cl2] (1) and [Hg2(AEPC)2(μ-Cl)2Cl2] (2), of 2-(2-(pyridin-2-yl)oxazolidin-3-yl)ethanol (AEPC) were prepared and identified by elemental analysis, FT-IR, 1 H NMR spectroscopies and single-crystal X-ray diffraction. All coordination modes of 2-(pyridin-2-yl)oxazolidine derivatives were studied by analysis of the Cambridge Structural Database (CSD) for determination of coordination behaviors of the AEPC ligand with metals. In the crystal structure of 1, the cadmium atom has a distorted octahedral geometry and CdN2OCl3 environment in which each ligand acts as 2 an NN'O-donor. In the crystal structure of 2, the AEPC acts as NN'-donor toward the mercury atom to form a square-pyramidal geometry with three chloride ions. Each complex contains four chiral centers and R,R,S,S configuration with a center of inversion and Ci symmetry. In the crystal networks of the complexes, the alcoholic group of the ligands participate in hydrogen bonding and form R4 4 (28) and R6 6 (44) hydrogen bond motifs (observed for complex 1). In addition to the hydrogen bonds, the crystal network is stabilized by π-π stacking interactions between pyridine rings of the AEPC ligands of adjacent complexes.