A Spectral and Structural Study of the New Cadmium Salt [(H₂L)₂][Cd₂I₆][(NO₃)₂]

Abstract

The reaction between 2-(piperazin-1-yl)ethanol and cyclohexene oxide under microwave irradiation gave 2-(4-(2-hydroxyethyl)(1) was prepared from the reaction of cadmium iodide with L and identified by elemental analysis, FT-IR and Raman spectroscopy, and single-crystal X-ray diffraction. In the crystal structure of 1, there is a [Cd 2 I 6 ] 2− dianion with distorted tetrahedral geometry for each cadmium atom. The piperazine and cyclohexane rings in 1 have a chair conformation. In the crystal there are several intermolecular hydrogen bonds including N-H···O, O-H···O, O-H···I, C-H···O, and C-H···I interactions.

Synthesis and luminescent spectroscopy of lanthanide complexes with dimethylpyridine-2,6-dicarboxylate (dmpc)

“…2i-b [24,31]. The two absorption bands observed at 1448 and 1439 cm À 1 in the IR of the dmpc may be assigned to δ(CH 3 ) [6]. On complexation, the first band was not distinctly observed and probably has merged with the free nitrate vibration.…”

“…(b) bichelate-β mode, via one carbonyl oxygen, one alkoxy oxygen and pyridine nitrogen atoms [6][7][8][9]; and (c) monochelate mode, via one carbonyl oxygen and pyridine nitrogen atoms [6,10]. In most cases, the bichelate-α coordination mode is more favorable in terms of steric and electronic factors.…”

“…On the contrary, a few studies were reported on the metal complexes of its ester especially dimethylpyridine-2,6-dicarboxylate (dmpc) [6][7][8][9][10][11][12][13]. As reported in the literature, the dmpc can coordinate to metal ions in three different coordination modes, Scheme 1; (a) bichelate-α mode, via two carbonyl oxygen and pyridine nitrogen atoms [6][7][8][9];…”

Structural study of the coordination behavior of a tetradentate NO3-donor amino alcohol ligand toward a CdII:HgII mixture

“…Amino alcohol functional groups are often found in biologically active molecules, ligands and chiral auxiliaries [1][2][3]. These types of ligands contain several coordination sites, which may interact with a metal center in different ways.…”

“…These types of ligands contain several coordination sites, which may interact with a metal center in different ways. An example of such ligands is 2,2′,2″-nitrilotriethanol (NTE), which [based on Cambridge Structural Database (CSD) data [4]] can act as NO 3 -, NO 2 -, NO-, O 3 -and O 2 -donor; the NO 3 -donor form is the most commonly observed. Complexes containing both cadmium and mercury atoms are rare and only 14 structures have been reported [5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”