New Polymeric Manganese Azide Derivatives with Quinazoline

Abstract

(2) (quinaz = quinazoline) have been structurally and magnetically characterised. Compound 1 crystallises in the triclinic system, space group P1, and consists of 1D chains with single end-to-end azido bridges. These chains give a two-dimensional supramolecular arrangement by means of H-bond interactions. Compound 2 crystallises in the monoclinic system, space group C2/c, and contains a

One-dimensional manganese(II) complex with only end-to-end azide ligands: Crystal structure and magnetic characterization

“…Up to now, there have been many reports on manganese(II)-azido polymeric systems [14][15][16][17][18]. However, to the best of our knowledge, there are only several examples of one-dimensional manganese(II) complexes bridged by the single end-to-end azido ligand [19][20][21][22][23]. Hence, we report herein the synthesis, structure and magnetic properties of a novel one-dimensional azide-manganese(II) complex [Mn(L) 2 (N 3 )](ClO 4 ) 1, where L is the bidentate Schiff base obtained from the condensation of pyridine-2-carbaldehyde with 4-methoxyl aniline.…”

Homoleptic manganese(II)–azide layer: Synthesis, structural characterization and magnetic properties

“…1 and the relevant parameters are summarized in Table 1. observations are uncommon, because the single EE-azido bridges usually adopt the asymmetric mode to give relatively inclined metal coordination spheres [5,[9][10][11][12][13][14][15][16]. Such structural characteristics should have impacts on magnetic behaviors, as will be discussed below.…”

“…All the J values lie in the range of 2.2-4.9 cm À1 [9][10][11][12][13][14][15][16]. It is worthwhile to give some remarks on magneto-structural correlations in such systems.…”

“…Particular interest has been focused on the azido ligand for its diversity in coordination modes and efficiency in magnetic coupling, and a large number of azido-bridged complexes with different dimensionalities and various topologies have been reported in the literature [4][5][6]. These complexes can be divided into two classes besides the neutral binary metal azides [7,8]: (i) heteroleptic complexes with coligands [9][10][11][12][13][14][15][16] and (ii) homoleptic anionic ones with charge-balancing cations that may act as templates for the anionic metal-azide substructures [17][18][19][20][21][22]. Considerable progress has been made in the synthesis and characterization of the former class, but the latter class has been relatively rarely explored.…”

A New Triazine‐Based Tricompartmental Ligand for Stepwise Assembly of Mononuclear, Dinuclear, and 1D‐Polymeric Heptacoordinate Manganese(II)/Azido Complexes

“…Evaluation of the effect of the torsion angle τ affords similar qualitative results: the antiferromagnetic interaction should be maximized for a planar arrangement of the Mn II ions and the azido bridge, but should be minimized for large torsion angles. The interesting conclusion derived from these calculations is that the μ-1,3-azido-bridged Mn II com- 162.9 180 -1.8 [28] [ [29] [Mn(R/S-L) 2 [32] [ plexes, in contrast to Ni II or Cu II complexes, should always be antiferromagnetic, even if the torsion angles are close to 90°or if the Mn-N-N angles are near to 160°. The reason is that Mn II complexes Ϫ apart from a main σ-interaction of the e 2g -orbitals of the metal ions with nonbonding π-MOs of the azido bridge Ϫ a pπ-dπ interaction pathway between the azido bridge and two of the t 2g orbitals (d xz , d yz ) is active.…”