Crystal and molecular structure of bis(2,4-pentanedionato)dimethyltin(IV)

Abstract

Bis(2,4-pentanedionato)dimethyltin (IV) carbonyl were in the range recorded for model 1:1 electrolytes,15 whereas measurements on the initial solution indicated the starting material was a nonelectrolyte.Isolation of [RuCl(CO)2TDPME]PF6. A suspension of 111 mg of RuCl2(CO)TDPME and 40 mg (an excess) of NH4PF6 in 8 ml of acetone was stirred under 40 psi of CO for 4 hr. The suspension color changed from yellow to white. Water was added dropwise, yielding initially a colorless solution and then a white precipitate. The solid was collected, washed with water, and dried to yield 105 mg of white powder. The infrared spectrum contained a strong band at 835 cm-1 characteristic of PFe" as well as the two vco-

Bis(1,3-diphenylpropane-1,3-dionato)tin(II)

“…The C-C distances in these six planes, which range from 1.359 to 1.418 A, indicate the existence of conjugation. The C-O distances are almost the same as those of other tincoordinated fl-diketonate rings (Ewings, Harrison & King, 1975;Miller & Schlemper, 1973;Bancroft, Davies, Payne & Sham, 1975). Planes B, IV and VI form an almost complete plane, as shown in Table 2.…”

“…The estimated standard deviations are within 0.004 A, and 0.1 ° including Sn, and 0.01/~ and 0.8 ° excluding Sn. Each of the four Sn-O distances lies within the range of distances found in various tin complexes (Jelen & Lindqvist, 1969;Kamenar & Grdeni6, 1961;Domingos & Sheldrick, 1974a,b;Kiriyama, Kitahama, Nakamura & Kiriyama, 1973;Miller & Schlemper, 1973;van Remoortere, Flynn, Boer & North, 1971;Bancroft, Davies, Payne & Sham, 1975). Sn-O(2) and Sn-O(4) are slightly longer than Sn-O(1) and Sn-O(3), and this could be attributed to some ionic character of the bonds.…”

DFT Calculations of the Electric Field Gradient at the Tin Nucleus as a Support of Structural Interpretation by 119Sn Mössbauer Spectroscopy

“…In fact the copresence of tin compounds with different structures is easily detected by 119 Sn Mçssbauer spectroscopy. [2,3] The value of dDE obtained for 20 is below the uncertainty associated with DE calcd , implying that the calculated DE value for the structure 20 is consistent with the experimental one, [29] whereas the same analysis performed on 20 a allows us to conclude that this structure, characterized by a j dDE j value larger than the associated error, has to be unequivocally discharged.…”

“…(2)] relative to some exemplary structures, fully optimized at the same level of theory (see Computational Details), were compared with the corresponding experimental DE values, to address the choice among possible structural hypotheses. The compounds selected, 20 a, 28 a and 28 b are geometrical isomers of 20 [29] and 28, [35] respectively, and the results obtained were collected in Table 2.…”

Mössbauer Spectra, Bonding, and Structure In Sn(IV) Acetylacetonates

“…1 , it is generally felt that in the trans-R,Sn compounds, most of the Sn 5s character will be concentrated in the Sn-R bonds, and the SnL, bonds will involve only Sn 5p character. However, Parish and Platt (7) have pointed out that in cis-R2Sn linkages the Sn 5s character in the Sn--R bonds should be substantially less and Mossbauer center shift values were consistent with this interpretation.…”