Template synthesis of a new P2N2 macrocyclic ligand via direct alkylation of co-ordinated amido nitrogen atoms; X-ray structure analysis of the free ligand and its neutral Ni II complex

Abstract

The dication [Ni(meso-L1)I2+, (11, [the NIl complex of the meso diastereoisomer of the ligand 1,3-bis((oaminophenyl)phenylphosphino}propane, rneso-Ll] on deprotonation gives the neutral complex, [Ni(meso-L1 -2H)],(2), with a cis-disposition of the two amido groups which undergo facile alkylation with propane-l,3-ditoluene-psulphonate to give [Ni(Lz-2H)], (3), a complex of the new P2N2 macrocycle meso-L2; X-ray structure analyses of the nitrate salt of (l), LZ, and (3) confirm the meso-configuration of the ligands.

Synthesis of bis[palladium(ii)] and bis[platinum(ii)] complexes containing chiral, linear quadridentate ligands with a P2N2 donor set

“…Diastereoisomerism arising from the presence of coordinated chiral secondary amines in kinetically inert transition metal complexes has been well documented. [20][21][22] The 31 P resonances of the dinuclear platinum() complexes were also flanked by satellites due to 195 Pt-31 P coupling, the 1 J PtP values of which were consistent with the phosphorus donor atoms being trans to chloro groups. 8, 23 Two broad singlet 31 P resonances flanked by satellites were similarly observed for the bis[dichloroplatinum()] complexes [(PtCl 2 ) 2 (µ-L)] [where L = (R P *,R P *)-or (R P *,S P *)-5] in their respective 31 P-{ 1 H} NMR spectra, however, the chemical shifts of the signals and the associated 195 Pt-31 P coupling constants in each case were significantly different.…”

Iron Complexes with Chiral N/P Macrocycles as Catalysts for Asymmetric Transfer Hydrogenation

“…This effect was exploited to prepare 12 from the corresponding meso open‐chain NPPN ligand, which was separated from the rac diastereoisomer by crystallization of its Ni(II) adduct . After the template synthesis, the meso diastereoisomer of the free ligand was obtained by demetallation with cyanide …”

STRUCTURAL ASPECT OF PLATINUM COORDINATION COMPOUNDS: PART III. MONOMERIC SQUARE PLANAR (Pt A2XY AND PtABXY) AND TRIGONAL BIPYRAMIDAL PtII COORDINATION COMPOUNDS

“…In one of these [401], the η 3 -ρηρ monovalent anion forms two almost equal five-membered metallocycles with N-Pt-P angles of 84.2(2)° and 84.9(2)°. In another [402], the Ti 3 -appp molecule forms a five N-Pt-P and a six P-Pt-P-membered rings for which the data are not available. The structure of trans-[PtTi 3 -bpbp)Clf cation [403a] is shown in Figure 6.…”