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5. Spectral data for selected compounds: Compound 2: 1H NMR (CDCl3, δ in ppm) 0.39 (s, 36H, CH3), 7.92 (AA′BB′, 8H, Ar), 8.17 (AA′BB′, 8H, Ar), 8.65 (s, 4H, β-pyrrole), 9.65 (s, 4H, β-thiophene). LD–MS C64H60N2S2Si4 calcd av. mass: 1033.7; obsd m/z: 1037.1. UV–vis (λmax, nm) 439, 516, 551, 632, 698. Compound 2a: 1H NMR (CDCl3, δ in ppm) 3.33 (s, 4H, CCH), 7.95 (AA′BB′, 8H, Ar), 8.20 (AA′BB′, 8H, Ar), 8.67 (s, 4H, β-pyrrole), 9.67 (s, 4H, β-thiophene). LD–MS C52H28N2S2 calcd av. mass: 744.9; obsd m/z: 746.4. UV–vis. (λmax, nm) 439, 516, 552, 633, 698. Compound 3: 1H NMR (CDCl3, δ in ppm) –2.63 (s, 8H, NH), 1.54 (m, 216H, -CH3), 7.83 (m, 12H, Ar), 8.05 (m, 24H, Ar), 8.13 (m, 8H, Ar), 8.22 (d, 8H, Ar), 8.34 (d, 8H, Ar), 8.41 (d, 8H, Ar), 8.88–8.97 (m, 36H, β-pyrrole), 9.89 (s, 4H, β-thiophene). LD–MS C324H332N18S2 calcd av. mass: 4542.5; obsd m/z: 4543.9. UV–vis (λmax, nm) 421, 441, 518, 555, 592, 648, 698.