Synthesis and coordination of 2-diphenylphosphinopicolinamide

Applications of transition metal complexes containing 3,3′-bis(diphenylphosphinoamine)-2,2′-bipyridine ligand to transfer hydrogenation of ketones

“…In the 13 C { 1 H} NMR spectrum of compound 2, J( 31 P 13 C) coupling constants of the carbons of the phenyl rings were observed, which are consistent with the literature values [50] (for details see Experimental section). In the 31 P { 1 H} NMR, a singlet at 23.38 ppm was assigned to compound [C 10 H 6 N 2 {NHPPh 2 Ir(h 5 -C 5 Me 5 )Cl 2 } 2 ], 3, in-line with the values previously observed for similar compounds [51,52]. Analysis by 1 H NMR reveals this compound to be diamagnetic, exhibiting signals corresponding to the aromatic rings for 3 at 8.21e7.35 ppm.…”

Ruthenium complexes of diphenylphosphino derivatives of carboxylic amides: Synthesis and characterization of bidentate P,N- and P,O-chelate ligands and their reactivity towards [RuCl2(PPh3)3]

“…Tables: Table 1 Selected bond lengths (Å) and angles (°) of 1a, 1b and 1c. (10) 96.73 (13) 103.26 (12) 97.13 (11) 104.31 (12) 102.05 (10) 103.21(10) C-P2-N2 99.33 (12) 104.97 (11) 102.76 (9) 103.72(10) P-N-C carbonyl 115.81 (15) 117.69 (19) 115.08 (17) 117.86 (14) 116.17 (17) Selected bond lengths (Å) and angles (°) of 3c I and 3c II . …”

“…Moreover, phosphino-functionalized carboxylic amides, which still bear an acidic proton (N−H moiety) can be utilized as mono-anionic bidentate chelators upon deprotonation, and their coordination chemistry has been studied with a variety of transition metal compounds (some examples are shown in Scheme 1, C, D and E) [13,14]. Phosphino-functionalized carboxylic amides devoid of this acidic N−H feature (or in general lacking the capability of forming the corresponding anion) can thus only serve as neutral chelators, hence lacking some electrostatic binding force, which should render these ligands more labile.…”

“…In general, the P,N [7] and P, O [8] bidentate donor sets may exhibit mono-vs. bidentate ligand characteristics, and in combination with rather soft transition metal atoms the phosphorus atom represents the superior σ-donor over the N or O atom in case of monodentate binding in the transition metal coordination sphere (A, B and C in Scheme 1). This hemilabile property is supportive in many catalytic processes like oligo-and polymerization, carbonylation as well as hydro-and dehydrogenation [8][9][10][11][12].Moreover, phosphino-functionalized carboxylic amides, which still bear an acidic proton (N−H moiety) can be utilized as mono-anionic bidentate chelators upon deprotonation, and their coordination chemistry has been studied with a variety of transition metal compounds (some examples are shown in Scheme 1, C, D and E) [13,14]. Phosphino-functionalized carboxylic amides devoid of this acidic N−H feature (or in general lacking the capability of forming the corresponding anion) can thus only serve as neutral chelators, hence lacking some electrostatic binding force, which should render these ligands more labile.…”

Study of the Effect of the Phosphane Bridging Chain Nature on the Structural and Photophysical Properties of a Series of Gold(I) Ethynylpyridine Complexes

“…The chains are parallel to the c axis and are shown in Figure 9. Some reports can be found where N···Au contacts have a decisive influence on the lattice organisation; for example, the compound [AuCl(2-diphenylphosphanylpicolinamide)], [54] where d(N···Au) = 3.129 Å, adopts a lattice distribution analogous to that of compound 9 and the complex [Au(tht) 2 The use of phosphanes with different backbones has allowed us to obtain a wide range of structures (molecules with no interactions, molecules with intramolecular interactions, molecules that form discrete dimers and molecules that assemble into polymeric chains by intermolecular interactions), depending on the nature of the phosphane bridging chain. Although complexes with phosphane ligands that have restricted rotation due to the small bite angle between phosphorus atoms (dppip 3, triphos 9) displayed intramolecular Au···Au contacts, diphosphanes with conformationally flexible backbones (dppe 5, dppp 6, dppb 7) crystallise with the alkane chain fully extended and, in some cases, intermolecular Au···Au interactions link up the gold complexes to form extended chains (dppe 5).…”