Structural and spectroscopic characterization of Cd(II) coordination complexes with 4,4´-diaminodiphenylmethane
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CHIŞCA, Diana, MELNIK, E.. Structural and spectroscopic characterization of Cd(II) coordination complexes with 4,4´-diaminodiphenylmethane. In: Achievements and perspectives of modern chemistry, 9-11 octombrie 2019, Chişinău. Chisinau, Republic of Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2019, p. 80. ISBN 978-9975-62-428-2.
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Achievements and perspectives of modern chemistry 2019
Conferința "International Conference "Achievements and perspectives of modern chemistry""
Chişinău, Moldova, 9-11 octombrie 2019

Structural and spectroscopic characterization of Cd(II) coordination complexes with 4,4´-diaminodiphenylmethane


Pag. 80-80

Chişca Diana12, Melnik E.1
 
1 Institute of Applied Physics,
2 Tiraspol State University
 
Disponibil în IBN: 4 noiembrie 2019


Rezumat

In the research of supramolecular chemistry, much interest has recently been focused on the crystal engineering of coordination frameworks because of their intriguing architectures, fascinating topologies, intertwining phenomena, and potential application in functional materials [1]. The family of metallacyclic nanostructures assembled from transition metal and bridging ligands containing nitrogen donor’s atoms is now a well-established group of coordination polymers, and the diversity of such coordination nanostructures makes them remarkable examples in the growing library of self-assembled entities [2]. The ligand 4,4´-diaminodiphenylmethane (dadpm) may be utilized as a building block for the construction of novel organic/inorganic hybrid materials. Herein, we report on the selfassembly reactions of dadpm ligand and cadmium(II) perchlorate or acetate, combined with the structural and IR characterizations of the monomer [Cd(dadpm)2(CH3COO)2(H2O)2] (1) and 1D coordination polymer {[Cd(dadpm)6](ClO4)2}n(2). For both compounds the IR spectra were measuredand, compared with the pure ligand, they confirm the presence of organic ligand used in the syntheses. The absorption asymmetric and symmetric v(NH2) bandsare observed at 32693392 cm-1 and deformation vibrations b(NH) at 1612-1627 cm-1 regions. The bands at 2826-2886 cm-1 regions are assigned to the vs(CH2) and vas(CH2) stretching vibrations. Compounds 1 and 2 belong to the same monoclinic crystal system, but differ in space groups, P21/n for 1 and C2/c for 2. The X-ray analysis reveals that in 1 Cd(II) ion adopts a slightly distorted octahedral geometry with the N2O4-set of donor atoms going from two dadpm molecules in axial positions; two water molecules and two acetate anions coordinated in a monodentate mode occupy the equatorial positions (Fig. 1a). The complexes are linked in the H-bonded layer through hydrogen-bond interactions between coordinated water molecules as H-donor and the N atom of amino-ligand and carboxylic-group as acceptors. Compound 2 contains a six-coordinated Cd(II) center formed by N atoms from six different dadpm ligands, two coordinated monodentate and four - bidentate-bridging to the metal ion, forming a distorted N6 octahedral coordination core of Cd (Fig. 1b). In the crystal the coordination double chains are assembled via hydrogen-bond interaction between ClO4- anionand the amine ligands of adjacent Cd(II) atoms.