Bonding in the first-row transition-metal monocarbonyl molecules

Bach, Stephan B. H.; Taylor, C. A.; Zee, R. J. Van; Vala, Martin; Weltner, W.

doi:10.1021/ja00282a045

Cited by 47 publications

(44 citation statements)

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“…They also performed extensive kinetic studies, yielding the reaction rates of the radicals with Fe͑CO͒ 5 and CO 7 and the branching ratios of photofragments from Fe͑CO͒ 5 by excimer laser photolysis. 8 The measurement of ESR 15,16 was attempted to determine the spin multiplicity of FeCO in the ground state, but resulted in failure due to large zero-field splitting ͑greater than 2 cm Ϫ1 ͒. Engelking and Lineberger obtained the electron affinity of FeCO of 1.26͑2͒ eV ͑Ref.…”

Section: Time-resolved Infrared Diode Laser Spectroscopy Of the 1 Banmentioning

confidence: 99%

Time-resolved infrared diode laser spectroscopy of the ν1 band of the iron carbonyl radical (FeCO) produced by the ultraviolet photolysis of Fe(CO)5

Tanaka¹,

Sakaguchi²,

Tanaka³

1997

The Journal of Chemical Physics

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Section: Time-resolved Infrared Diode Laser Spectroscopy Of the 1 Banmentioning

confidence: 99%

Time-resolved infrared diode laser spectroscopy of the ν1 band of the iron carbonyl radical (FeCO) produced by the ultraviolet photolysis of Fe(CO)5

Tanaka¹,

Sakaguchi²,

Tanaka³

1997

The Journal of Chemical Physics

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“…Scandium is the neighbor of Ti, yet, its carbonyl compounds are even much less than the Ti analogs. Up to date, the known homoleptic scandium carbonyls Sc(CO) n have been limited to n = 1–3 by means of the combined matrix and computational studies,10–12, 28 whereas Sc(CO) 4 has just been tentatively assigned in view of the observed infrared spectrum without the confirmation from theoretical studies 28. In fact, even for the small Sc(CO) 2 , there remains uncertain on which spin states correspond to the observed linear and bent structures.…”

Section: Introductionmentioning

confidence: 99%

B cell depletion with rituximab in patients with diffuse cutaneous systemic sclerosis

Lafyatis

Kissin

York

et al. 2009

Arthritis & Rheumatism

262

175

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Objective. To determine the safety of rituximab, to provide preliminary data regarding the potential efficacy of rituximab, and to investigate the effects of rituximab on autoimmunity and fibrosis in patients with diffuse cutaneous systemic sclerosis (dcSSc).Methods. Fifteen patients with dcSSc, all of whom experienced their first non-Raynaud's disease-associated disease manifestation within 18 months of trial entry, were recruited to receive 2 intravenous doses of rituximab (1,000 mg), administered 2 weeks apart. Safety, clinical, and exploratory outcomes were evaluated at baseline and at 6 months. The primary outcome was the change in the modified Rodnan skin thickness score (MRSS) at 6 months compared with baseline.Results. Adverse events included frequent infusion reactions and rare infections (urinary tract infection and dental abscess occurred in 1 patient each). The mean change in the MRSS between baseline and 6 months was not significant. Results of pulmonary function tests and other measures of major organ involvement were stable. The modest B cell infiltrates that were present in most skin biopsy specimens at baseline were completely depleted at 6 months in most patients. Autoantibody titers showed only modest and variable changes after treatment. Conclusion.In this pilot study, treatment with rituximab appeared to be safe and well tolerated among patients with dcSSc. Rituximab treatment resulted in both depletion of circulating B cells and depletion of dermal B cells but had little effect on the levels of SSc-associated autoantibodies. Rituximab treatment did not appear to result in a significant beneficial effect on skin disease. The potential efficacy of rituximab in other organs such as the lung could not be clearly evaluated in this small open-label trial.

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“…Extensive kinetic as well as spectroscopic studies have been carried out on these radicals. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Considerable theoretical works have also been published. [18][19][20][21][22][23] As for the FeCO radical, for example, it has been shown by a recent photodetachment study of the FeCO Ϫ anion 13 that the ground electronic state is of 3 ⌺ Ϫ symmetry and that the 5 ⌺ Ϫ excited electronic state is located only 3.24Ϯ0.07 kcal/mol above the ground state.…”

Section: Introductionmentioning

confidence: 99%

Time-resolved infrared diode laser spectroscopy of the ν3 band of the jet-cooled Fe(CO)2 radical produced by ultraviolet photolysis of Fe(CO)5

Tanaka

Tachikawa

Sakaguchi

et al. 1999

The Journal of Chemical Physics

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The infrared spectrum of the iron dicarbonyl radical Fe(CO)2 produced in a supersonic jet expansion by the excimer laser photolysis of iron pentacarbonyl Fe(CO)5 was observed by time-resolved infrared diode laser spectroscopy. About 170 transitions, each split into one or two fine structure components, were assigned to the ν3 (CO antisymmetric stretch) band of Fe(CO)2. The assignment was greatly facilitated by spectral simplification caused by rotational as well as vibrational cooling in the supersonic jet. It was observed that lines are missing at alternate J quantum numbers in each spin component, which confirmed that Fe(CO)2 is a linear molecule with D∞h symmetry and that the electronic ground state is of 3Σg− symmetry. The rotational and centrifugal distortion constants in the ground state were determined to be B0=1414.675(46) MHz and D0=0.3077(74) kHz, respectively. The spin–spin interaction constants obtained, λ0=655.3(42) GHz, is comparable with that of the FeCO radical, λ0=684.470(51) GHz. The ν3 band origin was determined to be 1928.184335 (82) cm−1. The figures in parentheses are uncertainties (1σ) in units of the last digit.

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Bonding in the first-row transition-metal monocarbonyl molecules

Cited by 47 publications

References 0 publications

Time-resolved infrared diode laser spectroscopy of the ν1 band of the iron carbonyl radical (FeCO) produced by the ultraviolet photolysis of Fe(CO)5

Time-resolved infrared diode laser spectroscopy of the ν1 band of the iron carbonyl radical (FeCO) produced by the ultraviolet photolysis of Fe(CO)5

B cell depletion with rituximab in patients with diffuse cutaneous systemic sclerosis

Time-resolved infrared diode laser spectroscopy of the ν3 band of the jet-cooled Fe(CO)2 radical produced by ultraviolet photolysis of Fe(CO)5

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