Classification of P,N-binucleating ligands for hetero- and homobimetallic complexes

A series of 6 cyclopentadienyl phosphanyl-pyridine piano-stool iron complexes was prepared in good yields, characterized, and studied in the catalytic reductive amination of benzaldehyde derivatives through hydrosilylation reactions by using polymethylhydrosiloxane as the hydrosilane source and in dimethylcarbonate as the solvent at 40 °C. Single-crystal X-ray structural analyses were performed for all the complexes.

Phosphane-Pyridine Iron Complexes: Synthesis, Characterization and Application in Reductive Amination through the Hydrosilylation Reaction

An imidazole-based P–N bridging ligand and its binuclear copper(I), silver(I) and palladium(I) complexes: synthesis, characterizations and X-ray structures

The synthesis and characterization of a range of Pt(II) and Ru(II) complexes containing the new 2-pyridyldiphosphine ligand, d(py)pcp = (made as a racemate) and the previously reported d(py)pe = (py)2P(CH2)2P(py)2 are given (py = 2-pyridyl). The Pt complexes made were cis-PtX2(d(py)pcp) (X = Cl (1), I (2)), cis-PtX2(d(py)pe) (X = Cl (3), I (4)), [Pt(d(py)pcp)2][PF6]2 (5), and [Pt(d(py)pe)2][PF6]2 (6); these all contain P,P-bonded diphosphine ligand, as evidenced by 31P NMR data and by crystallographic data in the case of 2 and 3. The X-ray structure of d(py)pe is also reported. The complexes RuX2(P,P,N-d(py)pcp)(PPh3) have cis-halogens and a P,P,N-bonding mode of the pyridyldiphosphine (which incorporates a four-membered P,N-chelate ring) with either a mer-arrangement (in 7a, X = Cl) or a fac-arrangement of the three P donor atoms (in 7b (X = Cl), 8 (X = Br), 9 (X = I)); cis-RuCl2(dppb)(P,N-PPh2(py)) (12) (dppb = Ph2P(CH2)4PPh2) is included because it has a donor set corresponding to that in 7b. Use of th...

Coordination Chemistry of the 2-Pyridyldiphosphine Ligands, (py)2P(CH(CH2)3CH)P(py)2 and (py)2P(CH2)2P(py)2 (py = 2-Pyridyl), with Platinum(II) and Ruthenium(II). Ruthenium-Catalyzed Hydrogenation of Imines†

Publisher Summary This chapter discusses the role of five- and six-membered heteroaromatic compounds as σ and π ligands. It also provides an overview of the multitude of structural types that can arise when heterocycles are used as ligands in organometallic derivatives. They are flexible models for the problem of competitive coordination of the hard and soft acids with the nonconjugated donor sites. They have great industrial importance in catalytic and other processes. In the chapter, the interaction of metals with the donor sites of the heteroaromatic ligands, including heteroatoms and the π-system of the heteroring is focused. They are classified as ambidentate σ and π - donor ligands and may form two types of complex compounds: the common σ and the less common π complexes. Synthetic methods for the preparation of coordination compounds of heterocycles are (1) the direct interaction of components, (2) ligand exchange, (3) the synthesis of hetarene complexes from the zero-valent metals, and (4) the synthesis of hetarene metal chelates. The basic method of synthesis is the direct interaction of ligands and metal species. Electrosynthesis is widely applied for the preparation of hetarene chelates. Donor atoms (E) and aromatic rings form the basis for the ability of heteroaromatic ligands to form complex compounds with the localization of the coordination bond.

Five-and Six-Membered Heteroaromatic Compounds as σ and π Ligands

Coordination chemistry of organometallic polydentate ligands. syntheses of Fe-M complexes using Fe(CO)4(Ph2Ppy-P)[Ph2Ppy = 2-(Diphenylphosphino)Pyridine] and TRANS-Fe(PhPMepy)2(CO)3[PhPMepy = 2-(Phenylmethylphosphino) Pyridine] AS A Neutral BI- OR Tridentate Ligand

Coordination chemistry of organometallic polydentate ligands Studies on the syntheses and properties of FeM binuclear complexes prepared from organometallic tridentate ligand trans-Fe(CO)3(Ph2Ppy)2 (Ph2Ppy = 2-(diphenylphosphino)pyridine)

Reaction of a new type of bidentate ligand PhPQu [PhPQu = 2-diphenylphosphino-4-methylquinoline] with Fe(CO)5 in butanol gave trans-Fe(FpPQu-P)(CO)3 (1) Compound 1, which can act as a neutral tridentate organometallic ligand, was reacted with I B, II B metal compounds and a rhodium complex to give six binuclear complexes with FeM bonds, Fe(CO)3 (μ-Ph2PQu)MXn (2–7) [M= Zn(II), Cd(II), Hg(II), Cu(I), Ag(I), Rh(I)], and an ion-pair complex [Fe(CO)3 (μ-Ph2PQu)2HgI][HgI3]− (8) The structure of 8 was determined by X-ray crystallography Complex 8 crystallizes in the space group P-1 with a = 10758(3), b = 16210(4), c=17155(4)nm; a=7560(2), β=7181(2), γ=8178(2)° and Z = 2 and its structure was refined to give agreement factors of R=0050 and Rw = 0057 The Fe-Hg bond distance is 02536nm

Coordination chemistry of organometallic polydentate ligand Reactive chemistry of the tridentate ligand trans‐Fe(Ph2PQu‐P)2‐(CO)3 [PhzPQu=2‐diphenyl‐phosphino‐4‐methylquinoline] and molecular structure of [Fe(CO)3(μ‐Ph2PQu)2HgI]+ [HgI3]

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Coordination chemistry of organometallic polydentate ligands. syntheses of Fe-M complexes using Fe(CO)4(Ph2Ppy-P)[Ph2Ppy = 2-(Diphenylphosphino)Pyridine] and TRANS-Fe(PhPMepy)2(CO)3[PhPMepy = 2-(Phenylmethylphosphino) Pyridine] AS A Neutral BI- OR Tridentate Ligand

Coordination chemistry of organometallic polydentate ligands Studies on the syntheses and properties of FeM binuclear complexes prepared from organometallic tridentate ligand trans-Fe(CO)3(Ph2Ppy)2 (Ph2Ppy = 2-(diphenylphosphino)pyridine)

Coordination chemistry of organometallic polydentate ligand Reactive chemistry of the tridentate ligand trans‐Fe(Ph2PQu‐P)2‐(CO)3 [PhzPQu=2‐diphenyl‐phosphino‐4‐methylquinoline] and molecular structure of [Fe(CO)3(μ‐Ph2PQu)2HgI]+ [HgI3]