Square-Planar and Octahedral Nickel(II) Complexes of Isomeric cis-2,9-Bis(aminomethyl)-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecanes

✍ Scribed by Bohdan Korybut-Daszkiewicz; Przemysaław Gluziński; Janusz Krajewski; Andrejas Kemme; Anatolij Mishnev

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 182 KB
• Volume: 1999
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/(sici)1099-0682(19990202)1999:2<263::aid-ejic263>3.0.co;2-j

✦ Synopsis

Isomeric cis-2, 9-bis(aminomethyl)-5,7,7,12,14,14-hexameth-in the Ni configuration, which is accompanied by a concomitant change of the macrocycle conformation from a yl-1,4,8,11-tetraazacyclotetradecanes (6a and 6b) and their octahedral (4) and square-planar nickel(II) complexes ( 5)

folded to a planar one. The structures of the protonated, square-planar complexes and of the free ligands have been have been prepared and characterized. X-ray crystallographic investigations of the octahedral complexes have established mainly on the basis of their 1 H-and 13 C-NMR spectra. confirmed a folded conformation of the macrocyclic ring. Protonation of the pendant amino groups results in a change