Tetranuclear Cu(ii) complex supported by a central μ₄-1,1,3,3 azide bridge

Abstract

The new cluster [Cu4L2(N3)]Cl.16H2O has been synthesized and characterized; it features a unique mu4-1,1,3,3 bridging mode for azide, whose capacity to mediate magnetic coupling has been examined through bulk magnetic measurements and numeric fitting procedures.

A rare polymeric azido-bridged copper(II) chain with a pentameric repeating unit: Synthesis, structure and magnetic properties

“…The flexibility in the coordination versatility of the azido ligand is clearly shown by its capacity to act either as terminal monodentate (Scheme 1a) or as a bridging bi-, tri-and tetra-dentate linker in different transition metal complexes (Scheme 1b-j) [8][9][10][11][12]. Thus, a careful search in the CCDC database (updated Nov-2011) shows a total of 1448 deposited structures of complexes with terminal N 3 ligands with any metal and a total of 345 complexes with Cu (Scheme 1-a).…”

“…In recent years, the field of polynuclear copper(II) complexes with Schiff base ligands in the presence of the azide anion as a bridging ligand has been an area of intense study, not only for their interesting molecular structures but also because they have potential applications and constitute ideal systems for understanding the nature of magnetic interactions [1][2][3][4][5][6][7]. The flexibility in the coordination versatility of the azido ligand is clearly shown by its capacity to act either as terminal monodentate (Scheme 1a) or as a bridging bi-, tri-and tetra-dentate linker in different transition metal complexes (Scheme 1b-j) [8][9][10][11][12].…”

Hydrolysis of imidazolidine ligands mediated by CuII: Mononuclear, tetranuclear and 1D CuII-amine complexes

“…From these studies, some conclusions could be drawn. Thus, in general, these ligands interact with f-block cations yielding M 2 L 2 complexes [4][5][6][7][8][9] while in the case of p-block [10] or first row d-block metals [11][12][13][14][15][16][17][18][19][20], the ligand allocates a metal ion in each of its NNO pockets, the central phenol oxygen atom acting as a bridge between them. These usually lead to [M 2 L] +n cations, the charge being balanced by free anions or anionic exogenous ligands.…”

New Mixed‐Metal Aggregates Derived From Dinickel Complexes on a 2‐Formylphenolate Template: Counteranion Dependent Formation of 1D Chain and Discrete NaNi2 Complexes

“…In recent years, we and others were interested in the multinucleating properties of the ligand H 3 L {2-(2Ј-hydroxyphenyl)-1,3-bis[4-(2-hydroxyphenyl)-3-azabut-3-enyl]-1,3-imidazolidine, Scheme 1} for various reasons, which include their importance in bioinorganic chemistry, molecular magnetism, and catalysis. [6][7][8][9][10][11] During the course of these investigations, we observed that under certain conditions, complexation reactions with Mn III , Fe III , Co III , or Cu II leads to the hydrolysis of the imidazolidine ring [12][13][14] and even the destruction of the imine bond. [15] The instability of some of the dinuclear Ni II complexes of a related ligand was also reported.…”