N-silylated benzamidines: versatile building blocks in main group and coordination chemistry

Edelmann, Frank T.

doi:10.1016/0010-8545(94)03012-f

Cited by 493 publications

(225 citation statements)

References 150 publications

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“…In particular, nitrogenpresence of triethylamine in dichloromethane. Removal of based systems have received considerable attention such as the solvent, extraction and crystallization from hexane gave trispyrazolylborates, [1] amides, [2] [3] amidinates, [4] aminoimithe product as yellow crystals in high yield. This synthetic nophosphoranates [5] and others.…”

Section: Resultsmentioning

confidence: 99%

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Titanium(III) Compounds with η2-Pyrazolato Ligands

Mösch‐Zanetti¹,

Krätzner

Lehmann

et al. 2000

Eur. J. Inorg. Chem.

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Section: Resultsmentioning

confidence: 99%

“…In reactions with other reducing agents such as Mg, Zn 3 days. The solvent was removed under reduced pressure, the reor KC 8 the only isolable product was the homoleptic [L 3 Ti] sulting dark brown mixture extracted with hexane (30 mL) and fil- (4). The mechanism of formation of compound 4 in the tered through Celite.…”

mentioning

confidence: 99%

Titanium(III) Compounds with η2-Pyrazolato Ligands

Mösch‐Zanetti¹,

Krätzner

Lehmann

et al. 2000

Eur. J. Inorg. Chem.

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“…[34] In addition to alkoxy ligands, amido ligands are especially good since they fulfill the requirement for effective steric shielding. Examples are the silyl-substituted benzamidinato ligands first described by Dehnicke et al [35] and Roesky et al [36] The foundations of lanthanoid chemistry were developed mainly by Edelmann et al [13,37] During these investigations it was demonstrated that in the case of central f element ions such ligands represent a steric equivalent to Cp ligands. [13,38] Comprehensive spectroscopic measurements on tris(benzamidinato)-and tris(cyclopentadienyl)lanthanoid complexes also confirm an electronic equivalence if the central Ln atom possesses a low electron affinity.…”

Section: Cp-free Organolanthanoid Chemistrymentioning

confidence: 99%

Highlights in the Renaissance of Amidometal Chemistry

Kempe¹

2000

Angewandte Chemie International Edition

271

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Turning a disadvantage to an advantage: The rather disappointing reactivity of the metal - nitrogen bond in comparison to the metal - carbon bond resulted in the neglect of amidometal chemistry after its heyday at the end of the 1960s and beginning of the 1970s. Today it is precisely this disadvantage which is being applied through the use of amido ligands to produce inert complex fragments with well-defined reaction centers. In this way the chemistry of the early transition metals has been markedly enriched, and interesting alternatives to the classically regarded cyclopentadienyl ligands are now available.

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“…8 Amidinate ligands are also known to enhance the thermodynamic stability of their complexes due to the chelating effect of the bidentate ligands. 9,10 Some transition metals, such as Cu, Co, Fe, Ru, Mn, and Ni, as well as their nitrides and oxides and rare earth oxides have been successfully grown by ALD from the corresponding amidinate precursors. 7,[11][12][13][14][15][16] However, the surface chemistry of these relatively new precursors has not yet been investigated in situ, because most studies to-date have focused on ex situ film characterization by electrical, physical, or chemical measurements.…”

Section: Introductionmentioning

confidence: 99%

In Situ Infrared Characterization during Atomic Layer Deposition of Lanthanum Oxide

et al. 2008

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Mechanisms of atomic layer deposition (ALD) growth of lanthanum oxide on H-terminated Si(111) using lanthanum tris(N,N′-diisopropylacetamidinate) (La( i Pr-MeAMD) 3 ) are investigated using infrared (IR) absorption spectroscopy. The reactivity of this amidinate precursor is high, with almost all surface Si-H bonds consumed after 5 ALD cycles at 300°C. Gas phase IR spectra show that, although most of the precursor (La( i Pr-MeAMD) 3 ) remains intact, a strong feature at 1665 cm -1 , characteristic of a hydrogenated and dissociated free ligand with localized electrons in the N-CdN bonds, is present. Such partial precursor dissociation in the gas phase is due to hydrolysis by traces of water vapor remaining in the reactor, even after purging. As a result, some Si-O-La bonds are formed upon reaction with the surface during the first La( i PrMeAMD) 3 pulse, prior to any water pulse. During film growth, acetate/carbonate and hydroxyl impurities are incorporated into the film. Annealing to 500°C in dry N 2 removes these impurities but fosters the growth of interfacial SiO 2 . Deposition at 300°C leads to decomposition of adsorbed ligands, as evidenced by the formation of cyanamide or carbodiimide vibrational bands (or both) at 1990 and 2110 cm -1 , respectively. Despite this decomposition, ideal self-limited ALD growth is maintained because the decomposed ligands are removed by the subsequent water pulse. Growth of pure lanthanum oxide films is often characterized by nonuniform film thickness if purging is not complete because of reversible absorption of water by the La 2 O 3 film. Uniform ALD growth can be maintained without a rigorous dry purge by introducing alternating trimethylaluminum (TMA)/D 2 O ALD cycles between La/D 2 O cycles.

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N-silylated benzamidines: versatile building blocks in main group and coordination chemistry

Cited by 493 publications

References 150 publications

Titanium(III) Compounds with η2-Pyrazolato Ligands

Titanium(III) Compounds with η2-Pyrazolato Ligands

Highlights in the Renaissance of Amidometal Chemistry

In Situ Infrared Characterization during Atomic Layer Deposition of Lanthanum Oxide

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