A comparative study of the vibrational spectra of (π-pyrrolyl)tricarbonylmanganese and (π-cyclopentadienyl)tricarbonylmanganese

Lokshin, B. V.; Rusach, E. B.; Setkina, V. N.; Pyshnograeva, N.I.

doi:10.1016/s0022-328x(00)89422-x

Cited by 25 publications

(3 citation statements)

References 15 publications

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“…The other two bands, close to the strong totally symmetric ones, can be attributed to modes 11‘ and 18‘, the intermediate being probably e 1 , because of the essentially coincidence with a corresponding infrared absorption. Some marginally different assignments 22,24,26 may be ruled out, because of the general pattern similarity, a pattern, interestingly, also found in the spectra of (pyrrolyl)Mn(CO) 3 …”

Section: Resultsmentioning

confidence: 93%

Vibrational Study of (η⁵-Cyclopentadienyl)metal Complexes

et al. 1997

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Raman and infrared spectral data on the vibrational modes of the M-(η 5 -C 5 H 5 ) unit have been collected and the fundamental assignments revisited. Complexes belonging to the metallocene series M(η 5 -C 5 H 5 ) and the cyclopentadienide salts [η 5 -C 5 H 5 -][M + ] have been studied, together with some monometallic (η 5 -C 5 H 5 )ML n and bimetallic (η 5 -C 5 H 5 ) 2 M 2 L 2n compounds. Comparison of the spectra shows a common vibrational pattern of the intraring modes, with minor variations in frequency and intensity, which allows the establishment of a vibrational fingerprint of general validity. Raman spectra give rise to a firm assignment of the skeletal metal-ring modes; a correlation is noted between the metal-ring stretch force constant and the metal-carbon distance. The approximate CH out-of-plane force constants vary considerably and presumably reflect different H-ring electrostatic repulsions.

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Section: Resultsmentioning

confidence: 93%

Vibrational Study of (η⁵-Cyclopentadienyl)metal Complexes

et al. 1997

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“…The carbonyl region of the IR spectrum of 6 a [BF 4 ] shows the expected three‐band pattern ($\tilde \nu$ =2040, 1972, 1922 cm −1 ). The band at highest energy (a 1 mode) displays a slight blue shift compared with both [CpMn(CO) 3 ] ($\tilde \nu$ = 2025 cm −1 13) and [( η 5 ‐3,4‐Me 2 C 4 H 2 P)Mn(CO 3 )] ($\tilde \nu$ =2032 cm −1 14). …”

Section: Resultsmentioning

confidence: 99%

Redox‐Induced Coordination Isomerization of a Phosphoniobenzophospholide

Gudat

Lewall

Nieger

et al. 2003

Chemistry A European J

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1-Triphenylphosphoniobenzo[c]phospholide 1 reacts with [M(CO)(5)Br] (M = Mn, Re) and [Mn(CO)(3)(naphthalene)][BF(4)] to give complexes cis-[M(CO)(4)(1)Br] (5 a,b) and [Mn(CO)(3)(1)][BF(4)] (6 a[BF(4)]), respectively, featuring eta(1)(P)- and eta(5)(pi)-coordination of the phosphole ring. The corresponding reactions with [M(2)(CO)(10)] proceed with conservation of the metal-metal bond and yield, depending on the reaction temperature, dinuclear complexes [M(2)(CO)(8)(1)] (M=Mn, 7 a) or [M(2)(CO)(6)(1)(2)] (M=Mn, Re, 8 a,b) with mu(2)-bridging eta(1)(P):eta(2)(Pdbond;C) coordination of the phosphole moiety. All complexes formed were characterized by spectroscopic data; 5 b, 6 a[BF(4)], and 8 a,b were characterized by X-ray diffraction studies as well. The structural and (31)P NMR data of the dinuclear manganese complex 8 a suggest that the interaction between the metal atoms and the eta(2)-bound Pdbond;C double bond moieties is dominated by the L-->M charge-transfer contribution; this hints at a very low back-donation ability of the central M(2)(CO)(6) fragment. Investigation of the reactions of the Mn complexes 6 a and 8 a with Mg or ferrocenium hexafluorophosphate ([Fc][PF(6)]), respectively, revealed that the chemically reversible mutual interconversion between both species was feasible. Likewise, oxidation of the rhenium complex 8 b with [Fc][PF(6)] gave spectroscopic evidence for the formation of a Re analogue of 6 a. Electrochemical studies suggested that the oxidation 8 a-->2 6 a involves two consecutive single-electron-transfer steps, the first of which is electrochemically reversible and produces a metastable radical cation that is detectable by ESR spectroscopy. The mutual interconversion between 6 a and 8 a represents the first case of a reversible coordination isomerization of a phosphaarene that is triggered by a redox process and might stimulate further studies directed at the use of dinuclear phosphaarene complexes in redox-catalysis.

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“…The IR spectra present the characteristic bands of the cyclopentadienyl ligands with Csv [6,7] or Cs symmetry (for ^-Me3SiC5H4) [8]. In Table I the bands corresponding to the cyanide and carbonyl ligands are reported and also those which correspond to the metal-ligand bonds.…”

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confidence: 99%

Reactions of n-C₅H₅Co(CO)₂ and n-Me₃SiC₅H₄Co(CO)₂ with (XCN)₂ and X(CN)₂ (X = S or Se)

Morán

Ibáñez

1982

Zeitschrift Für Naturforschung B

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Abstract The pseudohalogens (XCN)2 (X = S or Se) react with n-C5H5Co(CO)2 and n-Me3SiC5H4Co(CO)2 with formation of the 18 electron complexes, RCo(CO)(XCN)2 (R = n-C5H5 or n-Me3SiC5H4). By reactions with X(CN)2 (X = S or Se), the cyclopentadienyl cobalt dicarbonyls are transformed into the mixed complexes, RCo(CO)(CN)(XVN) (R = n-C5H5 or n-Me3SiC5H4. All the compounds are characterized by elemental analysis, IR, electronic and 1H NMR spectra. The thiocyanogen derivatives undergo linkage isomerism (N→S) in polar solvents.

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A comparative study of the vibrational spectra of (π-pyrrolyl)tricarbonylmanganese and (π-cyclopentadienyl)tricarbonylmanganese

Cited by 25 publications

References 15 publications

Vibrational Study of (η⁵-Cyclopentadienyl)metal Complexes

Vibrational Study of (η⁵-Cyclopentadienyl)metal Complexes

Redox‐Induced Coordination Isomerization of a Phosphoniobenzophospholide

Reactions of n-C₅H₅Co(CO)₂ and n-Me₃SiC₅H₄Co(CO)₂ with (XCN)₂ and X(CN)₂ (X = S or Se)

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A comparative study of the vibrational spectra of (π-pyrrolyl)tricarbonylmanganese and (π-cyclopentadienyl)tricarbonylmanganese

Cited by 25 publications

References 15 publications

Vibrational Study of (η5-Cyclopentadienyl)metal Complexes

Vibrational Study of (η5-Cyclopentadienyl)metal Complexes

Redox‐Induced Coordination Isomerization of a Phosphoniobenzophospholide

Reactions of n-C5H5Co(CO)2 and n-Me3SiC5H4Co(CO)2 with (XCN)2 and X(CN)2 (X = S or Se)

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Vibrational Study of (η⁵-Cyclopentadienyl)metal Complexes

Vibrational Study of (η⁵-Cyclopentadienyl)metal Complexes

Reactions of n-C₅H₅Co(CO)₂ and n-Me₃SiC₅H₄Co(CO)₂ with (XCN)₂ and X(CN)₂ (X = S or Se)