Abstract
Triphenylbismuth dicrotonate Ph 3 Bi(O 2 CCH=CHCH 3 ) 2 in benzene solution in the presence of 2-methyl-2-nitrosopropane decomposes in light. The phenyl radicals formed as the result of Ph 3 Bi(O 2 CCH=CHCH 3 ) 2 decomposition are confirmed by the spin-trapping method; they can initiate the methylmethacrylate polymerization at room temperature. In the absence of light the decomposition has not been observed.
Highlights
Previously, polymethylmethacrylate (PMMA) with addition of various Bi(V) organometallic compounds was obtained with the use of radical polymerization in the presence of initiators [1, 2]
We have investigated the decomposition of triphenylbismuth dicrotonate Ph3Bi(O2CCH=CHCH3)2 in benzene in the presence of MNP by EPR method
For the addition compound PhN(O)Bu-t the values of hyperfine interaction constants have been determined: aN = 12.3 Oe, aН1 = 1.8 Oe, аН2 = 0.85 Oe, g = 2.0056, which are in agreement with the literature data for the addition compound generated in benzene by photolysis of Ph3Bi, Ph3Sb, Ph3As [12], as well as with the data obtained for other sources of phenyl radical in benzene [13]
Summary
Polymethylmethacrylate (PMMA) with addition of various Bi(V) organometallic compounds was obtained with the use of radical polymerization in the presence of initiators [1, 2]. The previous study of the photo-induced cation polymerization of oxiranes and vinyl monomers was carried out with triaryl(1-pyrenyl)bismuth salts as initiators [3, 4]. It is known that organometallic compounds of bismuth(III) can cause the controlled living radical polymerization [5, 6] In this connection it seems interesting to study decomposition of Bi(V) compounds by the example of triphenylbismuth dicrotonate (TPBDCr) in diffused light by the spin-trapping method, as well as formation of metal-containing PMMA, with the use of this compound in the role of initiator. Synthesis of Ph3Bi. Triphenylbismuth was synthesized according to conventional procedure [9] from BiCl3 and PhMgBr with the use of the benzene and THF (1:2) mixture as the solvent.
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