3D hydrogen-bonded network built from copper(II) complexes of 1,3-propanediamine

Alexandre O Legendre,Regina H A Santos,Sandra R Ananias,Antonio E Mauro,Adelino V G Netto,Fabiana C Andrade,Fabiane R Martins,Janaina G Ferreira

doi:10.1590/s0103-50532006000800029

Abstract

The reaction of Cu(NO3)2.3H2O with 1,3-propanediamine (pn), in the presence of NaN3, afforded a 1:1 co-crystal formed by [Cu(NO3)2(pn)2] and [Cu(N3)(NO3)(pn)2 ] (1 and 2), which were characterized by elemental analysis, IR spectroscopy and single crystal X-ray diffraction. In both compounds, the copper(II) centers are in a distorted octahedral environment, formed by four N atoms of two bidentate pn ligands in the basal plane, whereas the axial bonds are formed by two O atoms from the nitrate ligands in 1 and one O atom from the nitrate ligand and one N atom from the azide ion in 2. The asymmetric unit of the crystal consists of two crystallographically independent 1 and 2 complexes, which are held together in a 3D network by a series of N-H···O and N-H···N hydrogen bonds, as well C-H···O interactions. New supramolecular synthons are identified by the occurrence of two geometrically distinct molecular recognition patterns involving the NO3- ion and amino groups from pn ligands.

Highlights

Much attention has been devoted to the investigation of transition metal-based supramolecular frameworks due to theoretical and challenging aspects in controlling the selfassembly processes, as well the potential uses of such materials in sensing, gas adsorption, magnetic devices, molecular electronics, porous and nanosized materials.[1]
In our recent works,[4] we have obtained a series of multidimensional supramolecular systems based on the selfassembly of discrete [Pd(SCN)2(3,5-dimethylpyrazole)2], and [M(NCS) ] (M = Co, Ni) by means of intermolecular hydrogen bonds, type N–H···NCS-Pd and
As part of our ongoing investigations on the coordination and supramolecular chemistry of metal pseudohalides complexes,[4,5] we report the

Summary

Introduction

Much attention has been devoted to the investigation of transition metal-based supramolecular frameworks due to theoretical and challenging aspects in controlling the selfassembly processes, as well the potential uses of such materials in sensing, gas adsorption, magnetic devices, molecular electronics, porous and nanosized materials.[1] Among the non-covalent interactions, which play a significant role in the molecular self-recognition of the components, within the crystal, the hydrogen bonding is. Blue crystals suitable for X-ray analysis were collected. The data collections for a single crystal were carried out on an Enraf Nonius CAD4 diffractometer, using graphite monochromated MoKα (λ = 0.71073Å) radiation. The structural analysis was performed by PLATON system.[11]

Results and Discussion

C3 C4 C6 C1A C3A C4A C6A N6A N7A

Conclusions