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Syntheses, characterization, and X–ray crystal structure of heteronuclear dicyanamide–bridged Cu/Na Assembled with Salen–type Schiff Base and Dicyanamide

Reaction of CuCl2 .2H2O with 2–(–(2–(–2–hydroxy–3– methoxybenzylideneamino)phenylimino)methyl)–6–methoxyphenol (H2L) gives the metalloligand [Cu(L)]. (H2O) (1). Reaction of metalloligand (1) with three fold of sodium dicyanamide Na[N(CN)2] gives the new tetranuclear compound [{Cu(?–L)Na(EtOH)}(?-1,5–N(CN)2){Cu(?–L)Na (N(CN)2)]}] (2). Suitable crystals of (2) were grown by slow evaporation of ethanol solution for one week. The metalloligand (1) and the tetranuclear (2) complexes are characterized by IR and physical measurement. The Schiff base H2L behave an N2O2O’2 coordination hexadentate ligand which can encapsulate two metal ions. The structure of (2) was elucidated by X–ray diffraction analysis. The asymmetric unit of the compound contains two dideprotonated ligand molecules, two tetracoordinated copper ions, two hexacoordinated sodium ions, one monodentate dicyanamide unit, one coordinated ethanol molecule and one dicyanamide ion which acts as a bridge between the two entities: [{Cu(?–L)Na(EtOH)}] and [{Cu(?–L)Na(N(CN)2)]}]. In the structure the tetracoordinated CuII ion is situated in the N2O2 inner. The environment around the copper (II) is best described as a planar square geometry. The two six–coordinated NaI ion are situated in NO5 and N2O4, respectively. The geometries around the NaI ions are described as pentagonal pyramidal. The interplanar angles between the two phenyl rings with a methoxy substituent is 4.208 (4)°. The Cu–Na distances are 3.3777(16) Å and 3.4001(15) Å. Intermolecular hydrogen bonds arranged the tetranuclear units into layers parallel to a axis.

Auteur(s) : Pokpa HABA, Mouhamadou Moustapha SOW, Papa Aly GAYE, Mamour SARR, Ibrahima Elhadji THIAM, Abdou Salam SALL, Pascal Retailleau, Mohamed GAYE
Pages : 57-64
Année de publication : 2021
Revue : IOSR Journal of Applied Chemistry (IOSR-JAC)
N° de volume : 14(4)
Type : Article
Mise en ligne par : GAYE Mohamed Lamine