The Molecular and Crystal Structure of Bis-Dimethyl Trimethine Cyanine Perchlorate, C7H15N2Cl04

✍ Scribed by Dr. K. Sieber; Dr. L. Kutschabsky; Dr. sc. S. Kulpe

• Publisher: John Wiley and Sons
• Year: 1974
• Tongue: English
• Weight: 458 KB
• Volume: 9
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.19740091005

✦ Synopsis

Abstract

The structure of the bis‐dimethyl trimethine cyanine perchlorate crystallizes in the space group Cc with the lattice constants a = 7,873 Å, b = 19.01 Å, c = 7.735 Å, β = 103.36°. It was spatially and anisotropically refined to a discrepancy factor of 0.09. The CC distances in the trimethine chains show the bond length compensation typical of polymethines. The NC distances are roughly similar and correspond to partial double bonds. The valence angles of the three methine carbon atoms alternate and are in turn above and below 120°. For the oxygen atoms of the perchlorate anions, a disorder‐like, statistical distribution on closely adjacent atomic layers is assumed. The trimethine chains are packed aggregation‐like in unidimensional stacks. Their centre planes and chain axes are not, however, parallel to each other.