CHARACTERISTIC VIBRATIONAL FREQUENCIES OF COMPOUNDS CONTAINING Si—O—Si, P—O—P, S—O—S, AND Cl—O—Cl BRIDGING GROUPS FORCE CONSTANTS AND BOND ORDERS FOR THE BRIDGE BONDS

1964 ◽  
Vol 42 (11) ◽  
pp. 2496-2503 ◽  
Author(s):  
R. J. Gillespie ◽  
E. A. Robinson
Keyword(s):  
Vibrational Spectra ◽  
Electron Pair ◽  
Vibrational Frequencies ◽  
Force Constants ◽  
Bond Orders ◽  
Characteristic Frequencies ◽  
Bond Lengths ◽  
Isoelectronic Series ◽  
Empirical Rule ◽  
Bridging Groups

The assignment of characteristic frequencies for the X—O—X group in compounds containing Si—O—Si, P—O—P, S—O—S, and Cl—O—Cl bonds is discussed with reference to the vibrational spectra of disiloxanes, diphosphoryl, and disulphuryl compounds and dichlorine heptoxide. The stretching force constants of the X—O—X bridging bonds have been obtained by treating the molecules as simple triatomic species X2O• X—O bond orders and bond lengths have been calculated from the stretching force constants and the calculated and observed bond lengths are compared. The variation in the observed X—O—X angles is related to the bond orders and is discussed in terms of the electron-pair repulsion theory. It is shown that bond orders in the isoelectronic series Si2O76−, P2O74−, S2O72−, and Cl2O7 may be simply deduced from the empirical rule that the valency shell of a second-row element tends to be occupied by twelve electrons (the duodecet rule).

CHARACTERISTIC VIBRATIONAL FREQUENCIES OF OXYGEN COMPOUNDS OF SILICON, PHOSPHORUS, AND CHLORINE: CORRELATION OF STRETCHING FREQUENCIES AND FORCE CONSTANTS WITH BOND LENGTHS AND BOND ORDERS

1963 ◽  
Vol 41 (12) ◽  
pp. 3021-3033 ◽  
Author(s):  
E. A. Robinson
Keyword(s):  
Bond Length ◽  
Force Constant ◽  
Chlorine Atom ◽  
Silicon Atom ◽  
Vibrational Frequencies ◽  
Force Constants ◽  
Bond Orders ◽  
Present Treatment ◽  
Bond Lengths ◽  
Linear Correlations

For oxygen compounds of chlorine, phosphorus, and silicon, respectively, correlations are established between stretching frequencies and force constants of Cl—O, P—O, and Si—O bonds, and their bond lengths.By deducing bond orders on the assumption that only [Formula: see text]and [Formula: see text] orbitals on the central chlorine, phosphorus, or silicon atom are utilized in the formation of double bonds with lone pairs of electrons on oxygen, linear correlations between bond orders and force constants are established.The present treatment leads to the conclusion that the presence of a maximum of 12 electrons in the valency shells of chlorine, phosphorus, and silicon is required to best explain the bond length and force constant data, when highly electronegative ligands such as oxygen or fluorine are attached to the central silicon, phosphorus, or chlorine atom.

Vibrational spectra of aquadioxotetra; peroxodivanadates(V) M2[V2O2(O2)4(H2O)]·xH2O (M = N(CH3)4, Cs)

1990 ◽  
Vol 55 (6) ◽  
pp. 1485-1490 ◽  
Author(s):  
Peter Schwendt ◽  
Milan Sýkora
Keyword(s):  
Raman Spectra ◽  
Vibrational Spectra ◽  
Normal Coordinate Analysis ◽  
Force Constants ◽  
Infrared And Raman Spectra ◽  
Empirical Correlations ◽  
Normal Coordinate ◽  
Bond Lengths ◽  
Stretching Vibrations

The infrared and Raman spectra of M2[V2O2(O2)4(H2O)]·xH2O and M2[V2O2(O2)4(D2O)]·xD2O (M = N(CH3)4, Cs) were measured. In the region of the vanadium-oxygen stretching vibrations, the spectra were interpreted based on normal coordinate analysis, employing empirical correlations between the bond lengths and force constants.

Notizen: Schwingungsspektren der Gold(I)-halogenide AuX (X = Cl, Br und I); Strukturprognosen für AuCl und AuBr / Vibrational Spectra of the Aurous Halides AuX (X= Cl, Br and I); Structural Prognoses for AuCl and AuBr

1974 ◽  
Vol 29 (11-12) ◽  
pp. 806-807 ◽  
Author(s):  
Dietrich Breitinger ◽  
Heiko Leuchtenstern
Keyword(s):  
Vibrational Spectra ◽  
Chain Structure ◽  
Force Constants ◽  
Bond Angles ◽  
Bond Lengths

Chain structure, Force constantsFrom vibrational spectra chain structures are predicted for AuCl and AuBr; bond angles, bond lengths and force constants have been estimated for these aurous halides.

Vibrational Spectra of the Hexacarbonyl Manganese(I) Cation

1974 ◽  
Vol 52 (2) ◽  
pp. 213-215 ◽  
Author(s):  
R. A. N. McLean
Keyword(s):  
Force Constant ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Vibrational Frequencies ◽  
Force Constants ◽  
Infrared And Raman Spectra

The infrared and Raman spectra of the hexacarbonylmanganese cation as Mn(CO)6+ PF6− were assigned by comparison with other hexacarbonyl species. The CO stretching force constants for Mn(CO)6+ and Re(CO)6+ as indicated by the CO stretching vibrational frequencies are not significantly different. However, the Mn—C force constant in Mn(CO)6+ is likely to be considerably less than the Cr—C force constant in Cr(CO)6, whereas Re(CO)6+ and W(CO)6 have similar values. It is postulated that, although Mn(CO)6+ has equal metal–carbon σ bonding to Re(CO)6+, the metal-carbon σ bonding is less for Mn(CO)6+.

Schwingungsspektren und Kraftkonstanten des Anions [BN2]3- in Li3BN2, Ca3B2N4 und Ba3B2N4 / Vibrational Spectra and Force Constants of the Anion [BN2]3- in Li3BN2, Ca3B2N4 and Ba3B2N4

1991 ◽  
Vol 46 (12) ◽  
pp. 1664-1668 ◽  
Author(s):  
Mehmet Somer
Keyword(s):  
Vibrational Spectra ◽  
Force Constants ◽  
Bond Orders ◽  
Isoelectronic Molecules

Vibrational spectra of the title compounds have been measured and assigned based on the symmetry D∞h of linear [BN,]3- units. The (B–N) force constants and bond orders have been calculated and compared with those of isoelectronic molecules and ions.

Struktur und Schwingungsspektren von Titan(III)-halogeno-Komplexverbindungen / Structure and Vibrational Spectra of Titanium (III) -halo-complexes

1970 ◽  
Vol 25 (10) ◽  
pp. 1087-1089 ◽  
Author(s):  
H. P. Fritz ◽  
W. P. Griffith ◽  
G. Stefaniak ◽  
R. S. Tobias
Keyword(s):  
Infrared Spectra ◽  
Vibrational Spectra ◽  
Force Constants ◽  
Complex Ions ◽  
Bond Lengths ◽  
Regular Octahedron ◽  
The Difference

The infrared spectra of polycrystalline pyridinium hexahalo titanates (III), (C5H6N) 3 [TiX6] (X = Cl, Br), show a slight deviation of the complex ions from the form of a regular octahedron, as previously found for K2Na [TiF6]. The spectra can be interpreted by assuming D4h symmetry. The difference between the axial and the equatorial TiX bond lengths is estimated by calculation of the force constants; it is in the order of about 0,01 A.

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