New rhodium(I) supramolecular structures containing pyridyl and bipyridyl ligands

Rodrı̀guez, Laura; Ferrer, Montserrat; Rossell, Oriol; Coco, Silverio

doi:10.1016/j.jorganchem.2009.08.014

Cited by 7 publications

(8 citation statements)

References 50 publications

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“…135 Hz. The value of these coupling constants is in the same range than the previously reported for 1b [40].…”

Section: Synthesis Of Rhodium Tetranuclear Complexessupporting

confidence: 82%

“…Evidence for the proposed structures was obtained from IR, 1 H-NMR and 31 P-NMR spectroscopy and MS spectrometry. 31 Some broadening of the signals was only observed for 1a and could be due to a dynamic process that involves the coordination-decoordination of the diphosphines, as previously observed for its analogue three-dimensional complex 1b [40].…”

Section: Scheme 1 Synthesis Of Dinuclear Complexes 1a-6asupporting

confidence: 63%

“…IR spectra show more complex (C≡O) stretching vibration patterns with respect to the two IR bands observed for the precursor, [RhCl(CO)2]2(-4,4'-bipy) (Figures S7 and S8) [40]. Each band splits in two with an additional lower energy vibration.…”

Section: Synthesis Of Rhodium Tetranuclear Complexesmentioning

confidence: 89%

“…Following the same experimental procedure previously reported by some of us [RhCl(CO)2]2(-4,4'-bipy) reacted with the corresponding diphosphine (Rh:P = 1:2) in dichloromethane for 1h. Actually compounds 1b [40], 5b and 6b were efficiently isolated, while the use of the other diphosphines (dppe, dppb, dppa) did not give rise to the formation of the desired products. The high rigidity of the dppa probably prevents the cage-type structure and the high flexibility of dppe and dppb favours the formation of oligomers.…”

Section: Synthesis Of Rhodium Tetranuclear Complexesmentioning

confidence: 98%

“…For all the reasons above we decided to go on with our previous work based on the synthesis of bi-and three-dimensional rhodium structures containing diphosphine ligands as linkers between metal atoms [40]. Their catalytic behaviour on hydrogenation reaction was analysed and the possible cooperative effects on these processes was studied and compared with the parent mononuclear rhodium complexes.…”

Section: Introductionmentioning

confidence: 99%

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Rhodium(I) macrocyclic and cage-like structures containing diphosphine bridging ligands

et al. 2016

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Three series of rhodium organometallic complexes, mono-(1c, 2c, 5c, 6c), di-(1a-6a) and tetranuclear (1b, 5b, 6b), containing six different diphosphines (1,1'bis(diphenylphosphino)methane or dppm (1), 1,2-bis(diphenylphosphino)ethane or dppe (2), 1,4-bis(diphenylphosphino)butane or dppb (3), bis(diphenylphosphino)acetylene or dppa (4), 1,2-bis(diphenylphosphino)benzene or dppbz (5) and 4,5-bis(diphenylphosphino)-9,9'-dimethylxanthene or xantphos (6) were successfully synthesised. These Rh(I) complexes were characterised by conventional techniques. The influence of the flexibility/rigidity of these P-donor ligands was carefully analysed, including their effect on both synthesis and catalysis. The luminescent properties of the dinuclear and tetranuclear complexes were investigated and only those containing dppa, dppbz and xantphos displayed luminescence. Structures of dinuclear complexes were modelled by using DFT methods in order to elucidate the most possible conformation. The different types of complexes were applied in the catalytic hydrogenation of (E)-4phenylbut-3-en-2-one, showing high activity and similar catalytic behaviour. No cooperative effect could be inferred.

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“…135 Hz. The value of these coupling constants is in the same range than the previously reported for 1b [40].…”

Section: Synthesis Of Rhodium Tetranuclear Complexessupporting

confidence: 82%

Section: Scheme 1 Synthesis Of Dinuclear Complexes 1a-6asupporting

confidence: 63%

Section: Synthesis Of Rhodium Tetranuclear Complexesmentioning

confidence: 89%

Section: Synthesis Of Rhodium Tetranuclear Complexesmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Rhodium(I) macrocyclic and cage-like structures containing diphosphine bridging ligands

et al. 2016

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New Insights into the Factors That Govern the Square/Triangle Equilibria of Pd(II) and Pt(II) Supramolecules. Unexpected Participation of a Mononuclear Species in the Equilibrium

et al. 2010

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The new rigid fluorinated ligand 4,4'-bis(4-pyridyl)octafluorobiphenyl (L1) has been synthesized by a nucleophilic substitution reaction between the organolithium derivative of the 4-bromopyridine and the compound decafluorobiphenyl. The use of L1 as building block of supramolecular species containing diphosphane or ethylenediamine Pd(II) and Pt(II) fragments has been explored, and the results have been compared with those previously reported for the smaller ligand 1,4-bis(4-pyridyl)tetrafluorobenzene (L2). The observed differences (particularly, square/triangle ratio) are discussed in terms of different parameters such as the nature of the ancillary ligands, solvent, or reaction temperature. The synthesis of water-soluble palladium metallamacrocycles derived from L1 has been attempted using ethylenediamine (en) or tetramethylethylenediamine (tmen) as ancillary ligand. Interestingly, in the latter case, the resulting solutions of the compounds showed, together with the square/triangle equilibrium, the unexpected presence of an additional lower nuclearity species, whose nature has been determined by means of bidimensional (1)H NMR experiments.

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Photophysics of transition metal complexes

Barigelletti

2010

Photochemistry

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This chapter deals with studies reporting the photophysical properties of selected transition-metal complexes, as extracted from journal articles appeared in the period July 2007 to December 2009. The transition metal species considered here belong to families of complexes featuring largely studied optical properties, in particular luminescence. The complexes are from the following metal centres: d6 Ru(II), Os(II), Re(I), Ir(III), and Rh(III), d8 Pt(II) and Pd(II), d10 Cu(I) and Au(I), d3 Cr(III); finally some mention is given of lanthanide (Ln) complexes.

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New rhodium(I) supramolecular structures containing pyridyl and bipyridyl ligands

Cited by 7 publications

References 50 publications

Rhodium(I) macrocyclic and cage-like structures containing diphosphine bridging ligands

Rhodium(I) macrocyclic and cage-like structures containing diphosphine bridging ligands

New Insights into the Factors That Govern the Square/Triangle Equilibria of Pd(II) and Pt(II) Supramolecules. Unexpected Participation of a Mononuclear Species in the Equilibrium

Photophysics of transition metal complexes

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