Iridium carbonyl clusters with pyridylphosphines: [Ir₄(CO)₉(PPh_xpyl_3−x)₃]

Abstract

[Ir4(CO)9(PR3)3] type complexes were obtained in the reaction between Ir4(CO)12 and the 2-pyridylphosphines: diphenyl(2-pyridy1)phosphine (PPh2pyl), phenylbis(2-pyridy1)phosphine (PPhpy12), tris-(2-pyridyl)phosphine (Ppy13) (pyl = 2-pyridyl) in methanol in basic medium, in the presence of carbon monoxide. The reaction conditions were determined and the products were spectroscopically characterized.

Activation of tri(2-furyl)phosphine at a dirhenium centre: Formation of phosphido-bridged dirhenium complexes

“…The chemistry of phosphine ligands bearing thienyl and pyrrolyl substituents has been widely investigated due to their respective importance in the hydrodesulfurization [10] and hydrodenitrogenation [11][12][13][14] processes, and some recent developments show the striking reactivity of these phosphines towards metal carbonyl clusters [15][16][17]. For example, the reactivity of metal carbonyls of the iron triad with functionalized phosphines such as Ph 2 PTh (Th = 2-thienyl) [17][18][19][20], Th 2 PPh [21], diphenyl(benzothienyl)phosphine [21], PTh 3 [16,22,23], diphenyl(2-pyridyl)phosphine [24][25][26][27][28][29][30][31][32][33][34][35] and 2-indolylphosphine [36] has been studied by several groups, revealing that the presence of the second coordinating atom provides a diversity of coordination modes with transition metal clusters.…”

Chiral hexarhodium carbonyl clusters containing heterobidentate phosphine ligands; a structural and reactivity study

“…The chemistry of transition metal complexes containing X-functionalised P-donor ligands (PX), where X is a two electron donor containing sulfur, nitrogen or oxygen atoms, or a C᎐ ᎐ C double bond, has been investigated quite intensively for both mononuclear, 2-6 and cluster compounds. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] From the viewpoint of structural chemistry, coordination of these potentially heterobidentate ligands to a cluster core can occur in various ways: chelating, bridging or in a simple κ 1 mode, usually through the phosphorus atom. Each of these is governed by particular properties of the ligand and metal centre or centres, as well as by particular mechanistic features of the ligand coordination process.…”

Mono- and dinuclear palladium complexes containing 2-pyridylphosphine ligands, including X-ray characterization of Pd2I2(µ-PPh2py)2 and a dimethylacetylenedicarboxylate A-frame complex Pd2Cl2(µ-Ppy3)2(µ-MeO2C•C=C•CO2Me); py = 2-pyridyl

“…Other structurally characterized Ppy, species are transRhCl(CO)(Ppy,),, which contains monodentate P-bound Ppy, (9), and R U ( P~~, ) , '~~ in which octahedral geometry is realized via the six pyridyl N-donors (10).…”

“…The use of such phosphines has also rekindled a long-standing interest of this group in metal-complex catalyzed hydration of olefins (4), a topic that is of current interest and one in which both platinum and palladium-phosphine complexes show promise (5)(6)(7). To these ends, we are developing further the chemistry of, and catalysis by, complexes containing 2-pyridyl(phosphine) ligands, a subject that in itself is accruing considerable recent literature (8)(9)(10)(11)(12)(13), following its instigation in the early 1970s within a PPh,py system (14); this mono-pyridyl ligand was used extensively by Balch and coworkers (15)(16)(17), the studies including a communication on PdClz(PPh2py), and Pd,Cl,(PPh,py), (17). Newkome et al (18) reported on cis and trans-PdCl,(PPhpy,),.…”