Formation of Metallamacrocycles from Palladium(II), Platinum(II) and Copper(I) Complexes and the Ditopic Ligands [{p-(Ph2PO)C6H4}2CMe2], [{2-Ph2PO-3,5-(Me3C)2C6H2}2S], [{p-[(C10H6O)2PO]C6H4}2CMe2]

Arena, Carmela Grazia; Drommi, Dario; Faraone, Felice; Graiff, Claudia; Tiripicchio, António

doi:10.1002/1099-0682(20011)2001:1<247::aid-ejic247>3.0.co;2-6

Cited by 15 publications

(6 citation statements)

References 21 publications

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“…We report here the efficient syntheses and complexing properties of two new semi‐rigid, ditopic bis‐phosphane ligands which further explore the relationship between ligand geometry and the structures of their transition metal complexes. The work extends recent reports on the formation of metallamacrocycles using related ligand types 11…”

Section: Introductionsupporting

confidence: 86%

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Semi-Rigid Bis-Phosphane Ligands for Metallamacrocycle Formation

Armstrong

Cross

Farrugia

et al. 2002

Eur. J. Inorg. Chem.

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Section: Introductionsupporting

confidence: 86%

“…Ditopic bis‐phosphanes are designed for coordination to two metal centres, with10 or without (e.g. Faraone’s ligand 3 11) metal−metal bonding. A further class of ligands involves monophosphanes on solid supports, whose coordination geometry is subject to different controls 12,13…”

Section: Introductionmentioning

confidence: 99%

Semi-Rigid Bis-Phosphane Ligands for Metallamacrocycle Formation

Armstrong

Cross

Farrugia

et al. 2002

Eur. J. Inorg. Chem.

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“…The 31 P NMR spectrum of PtCl 2 ( 1 ) shows a single peak at δ 64.5 ppm, flanked by 195 Pt satellites and a coupling constant J Pt - P of 4246 Hz. This value is a clear indication of the cis coordination of the diphosphinite to the platinum center. ,,− The chemical shift difference with the uncoordinated ligand Δδ is 34.2 ppm upfield in the 31 P NMR spectrum, considerably more than that found from the reaction to yield complex 5 , where Δδ is only 5.9 ppm upfield. In the 13 C NMR spectrum, the characteristic signals for the ipso carbons of the cyclopentyl side groups appeared in the normal region, in a 1:1:1:2:2 ratio.…”

Section: Resultsmentioning

confidence: 94%

A Silsesquioxane-Based Diphosphinite Ligand: Synthesis, DFT Study, and Coordination Chemistry

et al. 2003

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The incompletely condensed silsesquioxane disilanol (c-C 5 H 9 ) 7 Si 7 O 9 (OH) 2 OSiMePh 2 has been used as a backbone for the synthesis of the diphosphinite ligand (c-C 5 H 9 ) 7 Si 7 O 9 (OPPh 2 ) 2 -OSiMePh 2 (1), based on a silsesquioxane framework. By reaction with black selenium, the corresponding selenide (2) was obtained, showing a J Se-P value of 815 Hz in the 31 P NMR spectrum. DFT calculations established a good insight into the electron density of the P atoms present in the two model compounds CH 3 OPPh 2 (3) and Ph 2 P(HSiOH) 2 OPH 2 (4). The Mulliken charge distributions show a clear electron-withdrawing effect of the siloxy group, which is also present in diphosphinite ligand 1. By reaction of compound 1 with PdCl 2 -(C 6 H 5 CN) 2 , the palladium complex [PdCl 2 R(OPPh 2 ) 2 ] (5) was obtained (R ) (c-C 5 H 9 ) 7 Si 7 O 9 -OSiMePh 2 ). From a similar reaction of 1 with PtCl 2 (cod), the platinum analogue [PtCl 2 R(OPPh 2 ) 2 ] (6) could be isolated. The equimolar reaction of Mo(CO) 4 (pip) 2 (pip ) piperidine) with 1 yielded the molybdenum complex [Mo(CO) 4 R(OPPh 2 ) 2 ] (7). Ligand 1 showed a clear tendency to coordinate in a cis fashion for all complexes 5-7, as was determined by NMR spectroscopy and X-ray crystallography. However, the analogous reaction of 1 with RhCl(CO) 2 dimer yielded the mononuclear trans-[RhCl(CO)(1)] (8). Complexes 5-8 have been structurally characterized as the first examples of transition-metal complexes with a silsesquioxane-based bidentate phosphinite ligand.

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“…Unusual binuclear metal complexes 120a,b containing twentyeight-membered macrocycles 193 should also be pointed out.…”

Section: Compoundsmentioning

confidence: 99%

Chiral phosphites as ligands in asymmetric metal complex catalysis and synthesis of coordination compounds

Gavrilov¹,

Bondarev²,

Polosukhin³

2004

Russ. Chem. Rev.

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AlGaN/GaN/Si metal-insulator-semiconductor heterostructure field-effect transistors (MISHFETs) with SiN and Al 2 O 3 gate insulators are characterized by static and high-frequency measurements, and their performance is compared with nonpassivated and SiN-passivated heterostructure field-effect transistors (HFETs). The saturation drain current increased from ∼500 mA mm −1 for the HFETs to ∼770 mA mm −1 for the MISHFETs. The peak extrinsic transconductance of the MISHFETs (147 mS mm −1 for 8 nm SiN and 220 mS mm −1 for 4 nm Al 2 O 3 ) is higher than expected due to the increased gate-to-channel separation. Similarly, small signal microwave characterization yielded an increase in the current gain cut-off frequency (from 3.2 to 7.2 GHz) and the maximum frequency of oscillation (from 12.3 to 20.4 GHz) for the MISHFETs with 2 μm gate length compared to the HFET counterparts. Finally, the density of trap states, evaluated from the frequency-dependent conductance measurements, was ∼ =3 × 10 12 cm −2 eV −1 for the HFETs but only ∼ =1.8 × 10 12 cm −2 eV −1 for the MISHFETs. All of these demonstrate the capability of AlGaN/GaN MISHFETs of preparing high-performance and cost-effective devices for high-power microwave applications on a Si substrate.

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Formation of Metallamacrocycles from Palladium(II), Platinum(II) and Copper(I) Complexes and the Ditopic Ligands [{p-(Ph2PO)C6H4}2CMe2], [{2-Ph2PO-3,5-(Me3C)2C6H2}2S], [{p-[(C10H6O)2PO]C6H4}2CMe2]

Cited by 15 publications

References 21 publications

Semi-Rigid Bis-Phosphane Ligands for Metallamacrocycle Formation

Semi-Rigid Bis-Phosphane Ligands for Metallamacrocycle Formation

A Silsesquioxane-Based Diphosphinite Ligand: Synthesis, DFT Study, and Coordination Chemistry

Chiral phosphites as ligands in asymmetric metal complex catalysis and synthesis of coordination compounds

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