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- W2003295433 abstract "Abstract The X-ray structure of Ph4todit. CHCI3 (the title molecule) has shown that the crystals are monoclinic, space group P21/n, a = 13.393(5), b = 20.764(6), c = 12.286(5) Å, β = 97.88(2)°, V = 3384(2) Å3, Z = 4. Solution and refinement of intensity data gave final residuals of R = 0.0551 and Rw = 0.0680, using 2958 observed reflections [I > 2σ(I)]. A comparison with the previously reported structural data of the corresponding tetraethyl substituted compound (Et4todit) shows that the only significant differences are observed for the N[sbnd]C[sbnd]C[sbnd]N torsion angle (63.5(7)°, -70(1)° in the Et derivative), and for the values of the torsion angles indicating the orientation of the substituents with respect to the imidazoline ring plane. A spectrophotometric study on the reaction between diiodine and Ph4todit in CHCl3 has shown the formation of a 1:1 charge-transfer complex. A computer program has been used to refine the formation constant at six different temperatures and the extinction coefficients in the 260-520 nm range. The enthalpy of formation (δH° = -3.9(2) Kcal mol−1) falls in usual thione-diiodine complexes range. In the solid state a microcrystalline solid characterized as Ph4todit · 212 · 2CHCl3 has been isolated. FT-Raman spectra on this solid compound show a very strong band attributed to v(I[sbnd]I) at 172 cm−1. A comparison with the donor behaviour of Et4todit shows that the very small differences detected by means of u.v. visible measurements, suggesting the sequence order Et4todit > Ph4todit, are supported by FT-Raman results, which indicate that the donation of Et4todit produces a lengthening of the I[sbnd]I distance (v(I[sbnd]I) at 147 cm−1) larger than in Ph4todit." @default.
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- W2003295433 date "1991-10-01" @default.
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- W2003295433 title "A STUDY ON THE DONATING PROPERTIES OF 4,5,6,7-TETRATHIOCINO[1,2-b:3,4-b′]- DIIMIDAZOLYL-1,3,8,10-TETRAPHENYL-2,9- DITHIONE(Ph<sub>4</sub>todit) TOWARDS I<sub>2</sub>. CRYSTAL AND MOLECULAR STRUCTURE OF Ph<sub>4</sub>todit - CHCI<sub>3</sub>" @default.
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- W2003295433 doi "https://doi.org/10.1080/10426509108034458" @default.
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