Polyphenylenes (PP) are ð-conjugated polymers drawing a considerable interest from the mid-1960s as thermally stable materials.Nowadays, polyphenylenes are again in the focus of attention because of their unusual electrical and optical properties such as electrical conductivity, optical nonlinearity, luminescence, and therefore the possibility of using in organic light emitting diodes (OLEDs).Wide band gaps allowing emission of blue light (400-450 nm) are typical for polyphenylenes. The development of effective long-lived blue emitters remains a significant challenge in the field of OLEDs that makes polyphenylenes the polymers of interest. PP can be synthesized using different avenues. The majority of recent works were focused on linear PP. One of the successful methods to synthesize linear PP is Ni0-catalyzed homopolymerization of aromatic dibromides or dichlorides. This method leads to defect-free structures and seems to be promising for synthesis of polyphenylenes designed for optoelectronic devices.
The modern demands for OLEDs require a very robust synthetic procedure to obtain highly emissive PP with high yields. Since these PP should be both soluble in organic solvents and defect-free to provide high emission, we suggest here a combination of two techniques: (i) cyclocondensation of monoacetyl aromatic compounds with trimer formation (a central part of a starlike polymer) and (ii) Ni0-catalyzed dehalogenation for synthesis of branched defect-free polymers.
UCHEM has been manufacturing the following core structure of PP with cyclocondensation of monoacetyl aromatic compounds.
1,3,5-triphenylbenzene CAS: 612-71-5
1,3,5-Tris-p-tolylbenzene CAS: 50446-43-0
1,3,5-Tris(4-carboxyphenyl)benzene CAS: 50446-44-1
1,3,5-Tris(4-iodophenyl)benzene CAS: 151417-38-8
1,3,5-Tris(3-iodophenyl)benzene CAS: 855239-61-1
1,3,5-Tri(m-pyrid-3-yl-phenyl)benzene CAS: 921205-03-0
1,3,5-Tris(3,5-dibromophenyl)benzene CAS: 29102-67-8
1,3,5-Tri(3,5-bipyrid-3',3"-yl-phenyl)benzene CAS: 832080-38-3
1,3,5-Tris(4-nitrophenyl)benzene CAS: 29102-61-2
1,3,5-Tris(4-aminophenyl)benzene CAS: 118727-34-7
Most of the above are available from warehouse under 5kgs. UCHEM could provide service of contract manufacture with the robust process. Please contact with UCHEM if you are interested in the chemicals.