Producción Científica Profesorado

Syntheses and structural studies of hexa- and pentacoordinated Zn complexes derived from 2-(aminomethyl)benzimidazole and water.



Tapia Benavides, Antonio Rafael

2014

Syntheses and structural studies of hexa- and pentacoordinated Zn complexes derived from 2-(aminomethyl)benzimidazole and water. Elidia Gutiérrez-Sanjuan, Margarita Tlahuextl, Martha Falcón-León, Hugo Tlahuext, Yolanda Marmolejo-Santillán, and Antonio R. Tapia-Benavides*. Structural Chemistry.25, 1385?1393 (2014), Springer, USA, ISSN: 1040-0400 (Print, : OCT 2014), ISSN: 1572-9001 (Online, Feb 18). Número IDS: AP6FO. DOI: 10.1007/s11224-014-0416-4


Abstract


The complexes trans-bis[2-(aminomethyl)-1H-benzimidazole-? 2 N?,N?]diaquazinc(II) dichloride dihydrate 1 and trans-bis[2-(aminomethyl)-1H-benzimidazole-? 2 N?,N?]aquazinc(II) dichloride dihydrate 2 were synthesized selectively by the promotion of O?HCl hydrogen bond interactions. The hexacoordinated complex 1 was synthesized at pH 4.5. The dilution of 1 in deionized water produced the pentacoordinated complex 2. NMR and vibrational spectroscopies corroborated the presence of these compounds. Moreover, mass spectrometry and thermogravimetric (TGA) studies demonstrated that chloride ions and crystallization water molecules are essential for the stabilization of 1 but not for complex 2. X-ray diffraction crystallography studies indicated that the presence of two water molecules bonded to the Zn atom elongated all of the coordination bonds. The incidence of a network of hydrogen bond interactions compensates for the unstable hexacoordination. Natural bond orbital (NBO) and quantum theory of atoms in molecules (QTAIM) studies of the crystal structures of 1 and 2 were used to explain the nature of the coordination bonds and the complexes? stability .



Producto de Investigación




Artículos relacionados

Hydrogen bond studies in substituted N-(2-hydroxyphenyl)--2-[(4-methylbenzenesulfonyl)amino]acetamid...

trans-Bis[2-(aminomethyl)-1H-benzimidazole-2N2,N3]aquacopper(II) dichloride dihydrate

Crystal structure, ferromagnetostructural behavior and evidence of cooperative JahnTeller interactio...

Chlorination reactions of ephedrines revisited. Stereochemistry and functional groups effect on the ...

Acid-base equilibrium studies of 2-(aminomethyl)benzimidazolein aqueous solution

Synthesis of Zn compounds derived from 1H-benzimidazol-2-ylmethanamine

Structural and spectroscopic characterisation of tris(2-benzimidazolylmethyl)amine coordination comp...

Synthesis and structural studies of new N-(p-toluenesulfonyl)amino acid o-phenolamides

Structural studies of spiroarsoranes derived from 2-aminophenols

Addition reactions of protonic reagents to optically active 2-phenyl-1,3,2-oxazaborolines