The Synthesis and Structural Studies of some Dialkyltin(IV) Salts of Strong Monobasic Acids

1972 ◽  
Vol 50 (12) ◽  
pp. 1843-1851 ◽  
Author(s):  
T. H. Tan ◽  
J. R. Dalziel ◽  
P. A. Yeats ◽  
J. R. Sams ◽  
R. C. Thompson ◽  
...  
Keyword(s):  
Isomer Shift ◽  
Vibrational Spectra ◽  
Point Charge ◽  
Structural Studies ◽  
Regular Pattern ◽  
Octahedral Position ◽  
Alkyl Groups ◽  
In Trans ◽  
Anionic Groups ◽  
Charge Calculations

A number of dialkyltin(IV)-bisfluorosulfates, -bistrifluoromethanesulfonates, and -bisdifluorophosphates are synthesized by solvolysis of dialkyltin(IV) chlorides in an excess of the corresponding acid according to [Formula: see text] R = CH3, C2H5, n-C3H7, n-C4H9, and n-C8H17; X = SO3F, SO3CF3, and PO2F2. The structural proposals, hexacoordination for tin with the alkyl groups in trans-octahedral position and bidentate bridging anionic groups with coordination through oxygen, are based on 119Sn Mössbauer, infrared and, where obtainable, Raman spectra. The vibrational spectra of the difluorophosphates are discussed in detail. Variations in isomer shift and quadrupole splitting values with different alkyl groups in all three groups of compounds follow the same regular pattern as in the series R2SnF2. The results of point charge calculations are reported.

Bromine-79 NQR for uncoordinated Br– ions in trans-[CoBr2(en)2][H5O2]Br2

1992 ◽  
Vol 47 (1-2) ◽  
pp. 129-133 ◽  
Author(s):  
A. Sasane ◽  
T. Matsuda ◽  
H. Honda ◽  
Y. Mori
Keyword(s):  
Hydrogen Bond ◽  
Point Charge ◽  
Room Temperature ◽  
Bond Formation ◽  
Relative Magnitude ◽  
Hydrogen Atoms ◽  
Point Charge Model ◽  
Hydrogen Bond Formation ◽  
Charge Model ◽  
In Trans

AbstractA single 79Br NQR line showing a frequency of 19.594 MHz at room temperature has been observed in the crystals of trans-[CoBr2(en)2] [ H5O2 ] Br2 and assigned to the Br - ions which are not coordinated to the central Co(III) atom. The electric field gradient (EFG) at the Br - nuclei arises from O-H • • • Br - hydrogen bond formation between the Br - ions and the terminal O - H hydrogen atoms in [ H5O2 ] + ions. The induced EFG is greater for the present bromine complex than that for the isostructural chlorine complex. A point charge model calculation explains well the relative magnitude of the EFG in the two crystals by introducing Sternheimer's antishielding factors for the halogen ions.

Synthese, Schwingungs- und Massenspektren von Et2Sn(O2PR2)2 (R = Me, Ph); Kristallstruktur von Et2Sn(O2PPh2)2 / Synthesis, Vibrational Spectra and Mass Spectra of Et2Sn(O2PR2)2 (R = Me, Ph); Crystal Structure of Et2Sn(O2PPh2)2

1996 ◽  
Vol 51 (8) ◽  
pp. 1111-1116 ◽  
Author(s):  
Abdel-Fattah Shihada ◽  
Frank Weller
Keyword(s):  
Crystal Structure ◽  
Vibrational Spectra ◽  
Mass Spectra ◽  
Structure Refinement ◽  
Base Peak ◽  
Trans Position ◽  
X Ray Diffraction ◽  
X Ray ◽  
Octahedral Environment ◽  
In Trans

Et2Sn(O2PPh2)2 has been synthesized by the reaction of (Et2ClSn)2O with Ph2POCl in toluene and by the treatment of (Et2ClSn)2O or Et2SnCl2 with HO2PPh2 in methanol. The reaction of Et2SnO with HO2PMe2 in toluene was used to prepare Et2Sn(O2PMe2)2. An X-ray diffraction study of Et2Sn(O2PPh2)2 (space group P1̅, Z = 1, a = 559,9( 1), b = 983,7(1), c = 1262,4(l)pm, α = 81,85( 1 )°, β = 79,79( 1)°, γ = 75,00(1)°; structure refinement with 2662 independent reflections, R = 0.055) shows that the structure is polymeric and the O2PPh2 ligands function as double bridges between the tin atoms leading to the formation of centrosymmetric Sn2O4P2 eight-membered rings. The ethyl groups are in trans-position in the resulting octahedral environment around tin. The I. R. and Raman spectra of Et2Sn(O2PR2)2 (R = Ph, Me) have been discussed and assigned. The mass spectra of Et2Sn(O2PR2)2 show Sn(O2PR2)+ as the base peak.

scholarly journals Metabolic and Proteomic Perspectives of Augmentation of Nutritional Contents and Plant Defense in Vigna unguiculata

Biomolecules ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 224 ◽  
Author(s):  
Aqeel Ahmad ◽  
Tanveer Alam Khan ◽  
Samavia Mubeen ◽  
Iqra Shahzadi ◽  
Waheed Akram ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Vigna Unguiculata ◽  
Nutritional Value ◽  
Physiological Mechanism ◽  
Bioactive Compound ◽  
Macrophomina Phaseolina ◽  
Structural Studies ◽  
Elevated Activity ◽  
In Trans ◽  
Functional Mechanisms

The current study enlists metabolites of Alstonia scholaris with bioactivities, and the most active compound, 3-(1-methylpyrrolidin-2-yl) pyridine, was selected against Macrophomina phaseolina. Appraisal of the Alstonia metabolites identified the 3-(1-methylpyrrolidin-2-yl) pyridine as a bioactive compound which elevated vitamins and nutritional contents of Vigna unguiculata up to ≥18%, and other physiological parameters up to 28.9%. The bioactive compound (0.1%) upregulated key defense genes, shifted defense metabolism from salicylic acid to jasmonic acid, and induced glucanase enzymes for improved defenses. The structural studies categorized four glucanase-isozymes under beta-glycanases falling in (Trans) glycosidases with TIM beta/alpha-barrel fold. The study determined key-protein factors (Q9SAJ4) for elevated nutritional contents, along with its structural and functional mechanisms, as well as interactions with other loci. The nicotine-docked Q9SAJ4 protein showed a 200% elevated activity and interacted with AT1G79550.2, AT1G12900.1, AT1G13440.1, AT3G04120.1, and AT3G26650.1 loci to ramp up the metabolic processes. Furthermore, the study emphasizes the physiological mechanism involved in the enrichment of the nutritional contents of V. unguiculata. Metabolic studies concluded that increased melibiose and glucose 6-phosphate contents, accompanied by reduced trehalose (-0.9-fold), with sugar drifts to downstream pyruvate biosynthesis and acetyl Co-A metabolism mainly triggered nutritional contents. Hydrogen bonding at residues G.357, G.380, and G.381 docked nicotine with Q9SAJ4 and transformed its bilobed structure for easy exposure toward substrate molecules. The current study augments the nutritional value of edible stuff and supports agriculture-based country economies.

Structural studies of organosulfur compounds. 3. Stereochemistry and conformational distortions in trans-hexahydro-1,4-benzoxathiane S-oxides

1977 ◽  
Vol 42 (13) ◽  
pp. 2206-2211 ◽  
Author(s):  
Donna M. Frieze ◽  
Philip F. Hughes ◽  
Robert L. Merrill ◽  
Slayton A. Evans
Keyword(s):  
Organosulfur Compounds ◽  
Structural Studies ◽  
In Trans

The Synthesis, Mössbauer and Infrared Spectra of some Dialkyltin Salts of Phosphorus Oxy-acids

1973 ◽  
Vol 51 (22) ◽  
pp. 3702-3711 ◽  
Author(s):  
T. Chivers ◽  
J. H. G. Van Roode ◽  
J. N. R. Ruddick ◽  
J. R. Sams
Keyword(s):  
Aqueous Solution ◽  
Asymmetry Parameter ◽  
Methyl Groups ◽  
Formula Unit ◽  
Sodium Salts ◽  
Trigonal Bipyramidal ◽  
Alkyl Groups ◽  
In Trans ◽  
Polymeric Structures ◽  
Distorted Trigonal Bipyramidal

A number of dialkyltin(IV) salts of phosphorus oxy-acids R2Sn(PO2H2)2 (R = CH3, C2H5, n-C4H9), R2SnPO3X (R = CH3, C2H5, n-C4H9, X = H; R = CH3, X = F, OH), and [(CH3)2Sn]3(PO4)2 have been prepared in aqueous solution from the appropriate dialkyltin(IV) dichloride and the sodium salts of phosphorus oxy-acids.Infrared and 119Sn Mössbauer spectra of the dialkyltin dihypophosphites, R2Sn(PO2H2)2, are consistent with hexacoordination for tin with the alkyl groups in trans-octahedral positions and bidentate bridging hypophosphite groups coordinated through oxygens. For the dialkyltin phosphites, R2SnPO3X, polymeric structures with a non-linear R2Sn arrangement are involved, and the magnetic hyperfine Mössbauer spectrum (X = F) is consistent with either distorted trans-octahedral or distorted trigonal bipyramidal structures (with both apical or both equatorial methyl groups). In [(CH3)2Sn]3(PO4)2 the three tin environments are indistinguishable by Mössbauer spectroscopy, but the high value of the asymmetry parameter [Formula: see text] suggests penta- rather than hexacoordination about tin, for which at least one three-coordinate oxygen per formula unit must be invoked.

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