Infra-red absorption spectra of inorganic co-ordination complexes—XI

Nakagawa, Ichirô; Penland, R. B.; Mizushima, Shôji; Lane, Thomas J; Quagliano, J. V.

doi:10.1016/0371-1951(57)80132-5

Cited by 17 publications

(3 citation statements)

References 10 publications

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“…Assignments of the IR Bands. Previous work has shown that ammonia reacts with adsorbed dimethylaluminum to form an acid−base adduct (H 3 N→Al) and a bridging NH 2 (Al−NH 2 →Al) species. , Figure shows the effect of heating a TMA-covered alumina surface, which has been partially dehydroxylated at 400 K, in ammonia. At an annealing temperature of 423 K, this shows the saturation of the 1512 cm -1 peak and the clear appearance of a peak at 1552 cm -1 .…”

Section: Discussionmentioning

confidence: 99%

Spectroscopic Study of AlN Film Formation by the Sequential Reaction of Ammonia and Trimethylaluminum on Alumina

Soto

Boiadjiev

1996

Chem. Mater.

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Aluminum nitride is grown on an alumina substrate by several sequential exposures to trimethyl aluminum and ammonia. Broad similarities are evident between the chemistry in this case and that found for the reaction between trimethylaluminum and water except that temperatures of in excess of 500 K are required to form AlN layers whereas alumina is formed at room temperature. It is found, using infrared spectroscopy to examine the surface species formed during repeated sequential adsorption of trimethylaluminum and ammonia, that trimethylaluminum initially reacts to form an adsorbed dimethylaluminum species. This reacts with ammonia to initially form a Lewis acid-base adduct which subsequently reacts to form bridging and terminal NH 2 species. The first methyl group in the adsorbed species is found to be more reactive than the second, an effect that was also noted for reactions with water. The ultimate formation of AlN films by several sequential exposures to trimethylaluminum and ammonia is confirmed using X-ray photoelectron spectroscopy and gravimetrically by weighing the samples after several trimethylaluminum and ammonia exposure cycles.

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Section: Discussionmentioning

confidence: 99%

Spectroscopic Study of AlN Film Formation by the Sequential Reaction of Ammonia and Trimethylaluminum on Alumina

Soto

Boiadjiev

1996

Chem. Mater.

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“…11,14,15 The two bands at 3305 and 3290 cm . Thermogravimetric (TG) and differential thermal analysis (DTA) were carried out for the [Cr Fig.…”

Section: -17mentioning

confidence: 99%

Spectroscopic and Thermal Studies of [Cr₂(NH₂)₂(H₂O)₂(SO₄)₂]·2H₂O,[Cr(NCO)₃(H₂O)]·3H₂O and [Fe O(OH)]·0.2_H2O Compounds Formed by the Reactions of Urea with Cr₂(SO₄)₃, Cr(CH₃COO)₃AND Fe₂(SO₄)₃

Sadeek¹,

Refat²,

Teleb³

2004

Journal of the Korean Chemical Society

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, respectively ,with urea in aqueous media at 80 o C. The infrared spectra of the products indicate that the absence of the bands of urea , but shows the characteristic bands of coordinated amide, water, bridged sulphato and isocyanato groups. Thermogravimetric (TG) and differential thermal analysis (DTA) measurements on the complexes are also recorded. The data obtained agree quite well with the expected structures. A general mechanisms describing the formation and its thermal decomposition of the complexes are suggested.

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“…The species Hg(NH2)x-(x-2) is excluded at once by comparison with the known infrared spectra (29,30), The NH4+ ion is not easily distinguished from other products. The lines of mercuryammine complexes, on the other hand, are clearly observed in the spectra.…”

Section: Spectral Data For Possible Products Of Thementioning

confidence: 99%

A Raman Spectral Study of the Kinetics of Hydrolysis of Acetonitrile Catalyzed by Hg(II)

Sze¹,

Irish²

1975

Can. J. Chem.

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Yu-KEUNG SZE and DONALD E. IRISH. Can. J. Chem. 53,427 (1975). Rarnan spectroscopy has been employed to follow the relatively slow rate of hydrolysis of acetonitrile, catalyzed by rnercury(I1). Rarnan lines at 2275 and 2305 crn-' are characteristic of CH3CN bound to HgZ+, and are distinct from lines of bulk solvent. The intensities of these new lines decrease with time. From the intensities, concentrations of bound acetonitrile, [CH3CNIB were calculated for a time span of 400 min. The data fit a second order rate law: Rate = k[CH3CN], [HzO]. The specific rate constant, k, obtained from four sets of data for the system Hg(C104)2-CH,CN-HZ0 equals 1.05 t 0.06 x mol-' 1 min-' at 25 "C. The energy of activation is 18.9 kcal rnol-I. In the proposed mechanism water molecules attack acetonitrile molecules which are bound to HgZ+ and form a mercury(I1)-acetarnide complex. Raman lines characteristic of this species are observed. This species slowly converts to mercury(I1) arnmine complexes and acetic acid. Anions which coordinate with HgZ+ more strongly than CH3CN, such as nitrate or acetate, slow or prevent the hydrolysis reaction.

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Infra-red absorption spectra of inorganic co-ordination complexes—XI

Cited by 17 publications

References 10 publications

Spectroscopic Study of AlN Film Formation by the Sequential Reaction of Ammonia and Trimethylaluminum on Alumina

Spectroscopic Study of AlN Film Formation by the Sequential Reaction of Ammonia and Trimethylaluminum on Alumina

Spectroscopic and Thermal Studies of [Cr₂(NH₂)₂(H₂O)₂(SO₄)₂]·2H₂O,[Cr(NCO)₃(H₂O)]·3H₂O and [Fe O(OH)]·0.2_H2O Compounds Formed by the Reactions of Urea with Cr₂(SO₄)₃, Cr(CH₃COO)₃AND Fe₂(SO₄)₃

A Raman Spectral Study of the Kinetics of Hydrolysis of Acetonitrile Catalyzed by Hg(II)

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Infra-red absorption spectra of inorganic co-ordination complexes—XI

Cited by 17 publications

References 10 publications

Spectroscopic Study of AlN Film Formation by the Sequential Reaction of Ammonia and Trimethylaluminum on Alumina

Spectroscopic Study of AlN Film Formation by the Sequential Reaction of Ammonia and Trimethylaluminum on Alumina

Spectroscopic and Thermal Studies of [Cr2(NH2)2(H2O)2(SO4)2]·2H2O,[Cr(NCO)3(H2O)]·3H2O and [Fe O(OH)]·0.2H2O Compounds Formed by the Reactions of Urea with Cr2(SO4)3, Cr(CH3COO)3AND Fe2(SO4)3

A Raman Spectral Study of the Kinetics of Hydrolysis of Acetonitrile Catalyzed by Hg(II)

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Spectroscopic and Thermal Studies of [Cr₂(NH₂)₂(H₂O)₂(SO₄)₂]·2H₂O,[Cr(NCO)₃(H₂O)]·3H₂O and [Fe O(OH)]·0.2_H2O Compounds Formed by the Reactions of Urea with Cr₂(SO₄)₃, Cr(CH₃COO)₃AND Fe₂(SO₄)₃