The preparation and X-ray structure of [M{SePPh2)2N}2], M = Ni, Pd, Pt

Conversion of tetrahedral to octahedral structures upon solvent coordination: studies on the M[(OPPh2)(SePPh2)N]2(M = Co, Ni) and [Ni{(OPPh2)(EPPh2)N}2(dmf)2] (E = S, Se) complexes

“…In the case of 2, the Ni-O bond lengths are very similar to those found in pseudotetrahedral Ni[(OPPh 2 )(SPPh 2 )N] 2 (average 1.953 A ˚), 17 whereas the Ni-Se bond lengths are greater compared to those found in square planar Ni[(SePPh 2 ) 2 N] 2 (average 2.350 A ˚). 34 It is of interest that replacement of two Se by two O atoms in the latter complex converts its square planar structure to pseudo- 17 The dihedral angle between the O1NiSe1 and O2NiSe2 chelate planes (84.99 • ) is similar to that in Ni[(OPPh 2 )(SPPh 2 )N] 2 (85.34 • ), but significantly larger than in Ni[(OPPh 2 )(SPMe 2 )N] 2 (79.75 • ), the latter showing larger deviations from the ideal tetrahedral geometry, most likely due to the extra asymmetry induced by the presence of different peripheral groups bonded to the P atom of the ligand. 17 The X-ray structure of the protonated ligand (OPPh 2 )(SePPh 2 )NH has not yet been solved, but structural comparisons of 1 and 2 could be made with the crystallographically characterized {[OP(OPh) 2 ][SePPh 2 ]}NH ligand: 54 The P-N-P angles of 1 (133.9 • and 135.7 • ) are increased slightly compared to the corresponding angle in the ligand (131.8 • ).…”

The [Fe{(SePPh2)2N}2] Complex Revisited: X‐ray Crystallography, Magnetometry, High‐Frequency EPR, and Mössbauer Studies Reveal Its Tetrahedral FeIISe4 Coordination Sphere

“…The coordination of selenium to transition metals has also been explored by employing the so called dichalcogenidoimidodiphosphinato ligands, R 2 P(E)NHP(E′)R′ 2 (E, E′ = O, S, Se, Te; R, R ′ = alkyl or aryl groups) . Among this family of chelating ligands, L = [Ph 2 P(Se)NP(Se)Ph 2 ] – , containing E = E′ = Se as donor atoms, and R = R′ = Ph as peripheral groups bonded to the P atoms of the P–N–P backbone, has afforded the following structurally characterized homoleptic complexes with first series transition metal ions (structures deposited in the Cambridge Structural Database, CSD): octahedral M III L 3 , M = V, Cr, tetrahedral M II L 2 , M = Mn, Co, Zn, square planar Ni II L 2 and tetranuclear [Cu I 4 L 3 ]BF 4 …”

Alkali Metal and Alkaline Earth Metal Complexes with the Bis(borane‐diphenylphosphanyl)amido Ligand – Synthesis, Structures, and Catalysis for Ring‐Opening Polymerization of ϵ‐Caprolactone

“…[11,12] The di-chalcogenoimido-diphosphinto bismuth compounds, Bi[(EPR 2 ) 2 N] 3 (E = S, Se; R = Ph, iPr), were found to be ideal www.zaac.wiley-vch.de ARTICLE for use as single-source precursors as they are air-stable and readily obtainable in good synthetic yields. [13] The diselenoimido-diphosphinato ligand can also stabilize a wide range of metal coordination spheres including alkali metals, [14][15] group 12, [16] group 13, [17,18] group 14, [19,20,16] group 15, [21] group 16, [22,23] transition metals (V and Cr, [24] Mn [25,26] and Re, [27] Ru, Rh, Ir, [15,28,29] Os, [30] Co, [31] group 10: Ni, [32] Pd, [32,[33][34][35] Pt, [14,30,34] and group 11: [35] , and rare earth metals. [36,37] This could be due to the flexible nature of the ligand moieties, which adopt to several metallacyclic rings depending upon the coordination to the central metal atom.…”