Ni(0) catalysed homo-coupling reactions: a novel route towards the synthesis of multinuclear ruthenium polypyridine complexes featuring made-to-order properties

Fanni, Stefano; Pietro, Cinzia Di; Serroni, Scolastica; Campagna, Sebastiano; Vos, Johannes G.

doi:10.1016/s1387-7003(99)00182-3

Cited by 30 publications

(6 citation statements)

References 16 publications

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“…Improving electronic communication in such Ru(II)/Ru(III) complexes requires BLs with higher-energy orbitals such that the HOMO can become involved in hole transfer, cf. [ I ] + , and in Ru(II)/Ru(III) MV complexes anionic BLs often result in stronger metal−metal coupling than do comparable neutral BLs for exactly this reason. 2b,4a In particular, Haga et al and Vos et al have used protonation/deprotonation processes of triazole or imidazole groups in the bridging pathway to show that increasing the negative charge on the BL increases the metal−metal coupling.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Metal−Metal Electronic Interactions in an Isomeric Pair of Dinuclear Ruthenium Complexes with Different Bridging Pathways: Effective Hole Transfer through a Bis-phenolate Bridge

Ward

2001

Inorg. Chem.

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Section: Introductionmentioning

confidence: 99%

Comparison of Metal−Metal Electronic Interactions in an Isomeric Pair of Dinuclear Ruthenium Complexes with Different Bridging Pathways: Effective Hole Transfer through a Bis-phenolate Bridge

Ward

2001

Inorg. Chem.

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“…In three of these isomers (isomers a − c in Figure ), the Ru(bpy) 2 moiety is bound to a pyridine (or pyrazine) and a triazole ring; in the other two isomers, coordination takes place via the two central triazole rings and does not involve the pyridine and pyrazine rings (isomers d and e in Figure ) . To avoid the formation of so many different coordination isomers, a new synthetic method was developed . This method is based on the Ni(0) catalyzed coupling reported for bromide containing organic compounds …”

Section: Discussionmentioning

confidence: 99%

“…The important observation is that by control of the protonation of the bridge a three-way proton controlled molecular switch is obtained, which can be read by electrochemical or spectroscopic methods. A preliminary communication on this work has recently appeared …”

Section: Introductionmentioning

confidence: 99%

Proton Controlled Intramolecular Communication in Dinuclear Ruthenium(II) Polypyridine Complexes

et al. 2002

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The synthesis and characterization of two dinuclear ruthenium polypyridyl complexes based on the bridging ligands 5,5'-bis(pyridin-2' '-yl)-3,3'-bis(1H-1,2,4-triazole) and 5,5'-bis(pyrazin-2' '-yl)-3,3'-bis(1H-1,2,4-triazole) and of their mononuclear precursors are reported. The dinuclear compounds have been prepared by a Ni(0) catalyzed coupling of a mononuclear ruthenium(II) polypyridyl complex containing a brominated triazole moiety. Electrochemical and photophysical studies indicate that, in these dinuclear complexes, the protonation state of the bridge may be used to tune the intercomponent interaction between the two metal centers and that these species act as proton driven three-way molecular switches that can be read by electrochemical or luminescence techniques.

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“…In 2000, Fanni et al reported a new synthetic procedure for the efficient preparation of binuclear Ru(II) polypyridyl complexes, by performing intermolecular homocoupling between two 1,2,4-triazole bromide in the C3 position ( Scheme 13 ) [ 32 ]. The halide functional group is necessary to mediate the Ni-catalyzed reaction in the presence of triphenylphosphine and a zinc reducing reagent.…”

Section: Recent Advancement Of Bipyrazole Synthesesmentioning

confidence: 99%

Homocoupling Reactions of Azoles and Their Applications in Coordination Chemistry

2020

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Pyrazole, a member of the structural class of azoles, exhibits molecular properties of interest in pharmaceuticals and materials chemistry, owing to the two adjacent nitrogen atoms in the five-membered ring system. The weakly basic nitrogen atoms of deprotonated pyrazoles have been applied in coordination chemistry, particularly to access coordination polymers and metal-organic frameworks, and homocoupling reactions can in principle provide facile access to bipyrazole ligands. In this context, we summarize recent advances in homocoupling reactions of pyrazoles and other types of azoles (imidazoles, triazoles and tetrazoles) to highlight the utility of homocoupling reactions in synthesizing symmetric bi-heteroaryl systems compared with traditional synthesis. Metal-free reactions and transition-metal catalyzed homocoupling reactions are discussed with reaction mechanisms in detail.

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Ni(0) catalysed homo-coupling reactions: a novel route towards the synthesis of multinuclear ruthenium polypyridine complexes featuring made-to-order properties

Cited by 30 publications

References 16 publications

Comparison of Metal−Metal Electronic Interactions in an Isomeric Pair of Dinuclear Ruthenium Complexes with Different Bridging Pathways: Effective Hole Transfer through a Bis-phenolate Bridge

Comparison of Metal−Metal Electronic Interactions in an Isomeric Pair of Dinuclear Ruthenium Complexes with Different Bridging Pathways: Effective Hole Transfer through a Bis-phenolate Bridge

Proton Controlled Intramolecular Communication in Dinuclear Ruthenium(II) Polypyridine Complexes

Homocoupling Reactions of Azoles and Their Applications in Coordination Chemistry

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