Electron spin density distribution in the mobile phenyl rings of malondianils

✍ Scribed by C.L. Honeybourne

• Book ID: 103012342
• Publisher: Elsevier Science
• Year: 1971
• Tongue: English
• Weight: 347 KB
• Volume: 8
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(71)80076-3

✦ Synopsis

Comments are made concerning the proposed extent of rotation of the phenyl rings oE conrpkxes of mnlondianil. The mechanisms whereby a disparity in the spin densities at the two ortho-protons cm be generated =re discussed. Molin [l] has recently estimated that the phenyl rings in bis-(malondianilato) nickel (II), and related complexes, are at 51° to the electron spin containing orbital of the conjugated diimine chelating unit (see fig. 1). Evidence demonstrating that there is sufficient freedom of movement to average away, at room temperature, a minimum splitting of 170Hz (at 6OMHz) between the ortho-protons in the R = m-methyl, Rl = H compound (compound I) has already been presented [2]. In the R = m-methyl. Rl = methyl compound (compound II), there is a resolved room temperature splitting of 174Hz (at 100MHz)