science-softCon uv/vis+ spectra data base; www.uv-spectra.de; (C) science-softCon 2009 Substance: dicyanoacetylene Other Names: Formula: C4N2 CAS-No.: 1071-98-3 Study: photochemistry, photolysis Authors: Z. Guennoun, I. Couturier-Tamburelli, N. Piétri, J. P. Aycard Title: UV photoisomerisation of cyano and dicyanoacetylene: the first identification of CCNCH and CCCNCN isomers – matrix isolation, infrared and ab initio study Journal/Source: Chem. Phys. Lett., 368, 574-583, (2003); doi:10.1016/S0009-2614(02)01898-5 Data: Energy/Wavelength range: < 235 nm Resolution: Temperature: 10 K Temperature dependence: Pressure: Comments: Infrared spectra of UV photolysed cyanoacetylene and dicyanoacetylene trapped in argon matrices at 10 K have been performed. From cyanoacetylene photolysed at lambda>120 nm, we obtained three different isomers. The formation of HCCNC, HNCCC and the exotic one CCNCH is observed. In the case of photodissociation of dicyanoacetylene at lambda>235 nm, three others isomers were isolated: NCCCNC, CNCCNC and the higher energy one CCCNCN. Author to whom correspondence should be addressed: (e-mail address):