Polypyrazolylborate and Scorpionate Ligands

Pettinari, Cláudio; Santini, Carlo

doi:10.1016/b0-08-043748-6/01179-8

Cited by 91 publications

(109 citation statements)

References 338 publications

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“…[85,87,88] This review is aimed at providing an overview of structurally authenticated ethylene complexes of Cu I , Ag I , and Au I , and highlighting the key developments resulting from the use of nitrogen-based supporting ligands such as tris(pyrazolyl)-borates (scorpionates). [89] Some useful data from computational studies are also presented.…”

Section: Introductionmentioning

confidence: 99%

Structurally Characterized Coinage‐Metal–Ethylene Complexes

Dias

2008

Eur J Inorg Chem

127

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Despite the interest in them, easily isolable and thermally stable CuI, AgI, and AuI complexes of ethylene are stilllimited and get increasingly sparse as one descends the group 11 triad towards gold. Recently, there have been some notable developments in this field, including the isolation of gold–ethylene complexes and coinage‐metal adducts with more than one ethylene molecule on a metal center. This article focuses on the chemistry of coinage‐metal–ethylene adducts that have been synthesized and characterized by X‐ray crystallography. Thus far, bidentate and tridentate donors based on nitrogen appear to be the ligands of choice forstabilizing species with an M–C2H4 (M = CuI, AgI, and AuI) moiety. Weakly donating ligands and anions are also commonly used, as they do not interfere with and displace the ethylene from the metal center. The ethylene 13C NMR chemical shift provides useful information about the nature of the metal–ethylene interaction. In some adducts (especially those with relatively weak M–C2H4 interactions), the change in the C=C bond length upon coordination to the metal site is difficult to discern because it falls within the errors associated with the crystallographically determined C=C bond length value. IR and Raman C=C stretching data would be useful but, probably due to the very weak nature of the IR band and the lack of convenient access to the Raman instruments, are often not reported. In this microreview, results from some computational and gas‐phase spectroscopic studies are also provided for comparison.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

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Section: Introductionmentioning

confidence: 99%

Structurally Characterized Coinage‐Metal–Ethylene Complexes

Dias

2008

Eur J Inorg Chem

127

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“…The tris(3,5-dimethylpyrazolyl)hydridoborato ligands in 1 adopt an almost perfect staggered orientation with respect to each other (torsions 58.15 (17) . [14] The Zn À Zn bond length in 1 of 2.3560 (9) [8] and [Zn 2 (Dippnacnac) 2 ] (Dippnacnac = {(2,6-iPr 2 C 6 H 3 )N(Me)C} 2 CH; 2.3586(7) ) containing N,N'-chelating ligands.…”

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confidence: 99%

Novel Synthetic Pathway for New ZnZn‐Bonded Compounds from Dizincocene

Gondzik

Bläser

Wölper

et al. 2010

Chemistry A European J

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“…The smaller the cone angle, and the larger the wedge angle, the easier it is for other ligands coordination to the metal. Because of this feature, the proper choice of 3-R substituents does adjust the steric accessibility of the coordinated metal, in this fashion controlling the coordination chemistry of the [HB(pz R ) 3 ]M species (Trofimenko, 1999 (Trofimenko, 1999;Pettinari & Santini, 2004;Pellei et al, 2010;Santini et al, 2010 3 ]MX with C 3v -distorted tetrahedral geometries (Trofimenko et al, 1992). The cone angles depend not only on the ligand itself, but also on the length of the N-M bond.…”

Section: Introductionmentioning

confidence: 99%