1,2,4-Diazaphospholide Complexes of Barium: Mechanism of Formation and Crystallographic Characterization

catena-Poly[barium(II)-μ2-(dimethyl sulfoxide)-κ2 O:O-bis(μ2-2,4,6-trinitrophenolato-κ4 O 2,O 1:O 1,O 6)]

The Ba^II atom in the polymeric title compound, [Ba(C₂H₆OS)(C₆H₂N₃O₇)₂], lies on a mirror plane and is coordinated by ten oxygen atoms, two of which stem from symmetry-related DMSO ligands and eight from four symmetry-related picrate anions.

The asymmetric unit of the title barium coordination polymer, [Ba(C₆H₂N₃O₇)₂(C₂H₆OS)]_n, consists of a barium cation (site symmetry m) and a dimethyl sulfoxide (DMSO) ligand (point group symmetry m) and a 2,4,6-tri­nitro­phenolate anion located in general positions. The S atom and the methyl group of DMSO are disordered over two sets of sites. The DMSO ligand bridges a pair of Ba^II atoms resulting in a chain extending parallel to the a axis. The unique 2,4,6-tri­nitro­phenolate anion also bridges a pair of Ba^II ions via the phenolic oxygen atom, with each Ba^II being additionally bonded to an oxygen atom of an adjacent nitro group. The μ₂-monoatomic bridging binding mode of both types of ligands results in the formation of an infinite chain of face-sharing {BaO₁₀} polyhedra flanked by the remaining parts of the 2,4,6-tri­nitro­phenolato and DMSO ligands. In the one-dimensional coordination polymer, parallel chains are inter­linked with the aid of C—H⋯O hydrogen bonds.

Chromium(III) complexes with 1,2,4-diazaphospholide and 2,6-bis(N-1,2,4-diazaphosphol-1-yl) pyridine ligands: synthesis, X-ray structural characterization, EPR spectroscopy analysis, and magnetic susceptibility studies

Three chromium(III) 1,2,4-diazaphospholide complexes were prepared: 3,5-di-tert-butyl-1,2,4-diazaphospholide chromium(III) dichloride [(η 2-3,5-tBu2dp)Cr(THF)2Cl2] (1), 3,5-di-phenyl-1,2,4-diazaphospholide chromium(III) dichloride [(η 2-3,5-Ph2dp)Cr(THF)2Cl2] (2), and 2,6-bis(N-1,2,4-diazaphosphol-1-yl)pyridine chromium(III) trichloride {[2,6-bis(N-1,2,4-diazaphosphol-1-yl)pyridine]CrCl3} (3). X-ray diffraction analysis has shown that these six-coordinate complexes each have a pseudo-octahedral configuration. Electron paramagnetic resonance (EPR) spectroscopy data for complex 1 for the paramagnetic S = 3/2 system (d 3 electron configuration) confirm a Cr(III) center in the octahedral coordination environment. The magnetic susceptibility of complex 1 followed the Curie–Weiss law well between 25 and 300 K. The magnetic moment of 1 was found to be close to the spin-only magnetic moment expected for three unpaired electrons (3.87 μB).

1,2,4-Diazaphospholide complexes of yttrium(iii), dysprosium(iii), erbium(iii), and europium(ii,iii): synthesis, X-ray structural characterization, and EPR analysis

Several structurally characterized heteroleptic, charge-separated heterobimetallic, and polymeric alkali metal ate complexes of 1,2,4-diazaphospholide Y(iii), Dy(iii), Er(iii), Eu(iii), and Eu(ii) were prepared via the reaction of MCl3 and K[3,5-R2dp] in varied ratios at 200-220 °C (M = Y, Dy, Er, Eu; R = tBu, Ph).

Bis(chlorido)(dimethyl-sulfoxide-κO)barium(II)

The title compound, [BaCl₂(C₂H₆SO)], forms a Ba₆Cl₉ cluster in which the BaCl₂ units are connected via dimethyl­sulfoxide (DMSO) and chloride bridges. The central Cl atom of the Ba₆Cl₉ cluster is located on a threefold inversion axis and is coordinated octa­hedrally to six barium cations. In the crystal, the clusters are arranged in rows, which are inter­connected by the DMSO mol­ecules, forming a three-dimensional network.

Synthesis and structural characterization of 1,2,4-diazaphospholide complexes of titanium(IV) and titanium(III)

Two 1,2,4-diazaphospholide complexes of [Ti(η(2)-3,5-Ph(2)dp)(4)] and paramagnetic [Ti(η(2)-3,5-tBu(2)dp)(3)] were prepared by the reaction of tetrakis(dimethylamido)titanium(IV) with 3,5-diphenyl-1,2,4-diazaphophole, H[3,5-Ph(2)dp], or by the treatment of 3,5-tert-butyl-1,2,4-diazaphopholide potassium, K[3,5-tBu(2)dp], with titanium trichloride. Complexes can be viewed as the core of P(σ(2)λ(3))-functionalized metallodendrimers, in which the metal atoms are exclusively η(2)(N,N) bonding to the 1,2,4-diazaphospholides while P atoms (σ(2)λ(3)) with electron lone pairs are located on the periphery of the molecules.

[N,N-Bis(2,6-diisopropyl-phen-yl)pent-2-ene-2,4-diiminato(1-)]bis-(1,2,4-diaza-phosphol-1-yl)aluminium(III)

In the title compound, [Al(C₂₉H₄₁N₂)(C₂H₂N₂P)₂], the Al^III atom is coordinated by four N atoms from β-diketiminate and 1,2,4-diaza­phospho­lide ligands in a slightly distorted tetra­hedral fashion.