Synthesis and Structure of New Cationic Squarylium Dyes

✍ Scribed by Prof. Dr. Hiroyuki Nakazumi; Kazuki Natsukawa; Kazuhisa Nakai; Kakuzo Isagawa

• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 349 KB
• Volume: 33
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/anie.199410011

✦ Synopsis

tallization. Cooling i i i a freezer to -20°C afforded the product 2 as colorless crystals. Thew may he recrystallized by dissolving in refluxing ether and cooling. The )ield was about 70%. The crystals rapidly turned brown upon exposure to air and did no( melt upon heating to 300 C. The crystals showed evidence of desolvalion and decomposition oil heating above 100-C ' H N M R : (300MHz. 25 C in [D,]toluene. d = 0.99(hr, 36H.CH,(Et,0)).3.6(br,24H.CH,(Et2O)),6.75 (t.4H. ,I-H). 7.17 (in. 8 H . m-H). 7.4s (m. XH. n-H). I3C('H) NMR: (75.47MHz, [D,]roluene). 0 = 13.16 (s. CH,(Et,O)) 64.51 (CH,(Et,O)). 313.21 (s. OX). 124.04 (8. iii-r). IR the IR rpectrum (nujol mull) o f 2 in thc metal-ligand stretching region ( <GOO cm ~ 1 15 clixracterked by several medium intensify hands at 502.