A New Synthesis of Bis(3,3′-dimethyl-2,2′-dipyridylamine)copper(II) and the Crystal Structure of the Complex


The copper(II) complex (1) of the deprotonated form of 3,3′-dimethyl-2,2′-dipyridylamine has been prepared by reacting the ligand with freshly prepared copper(II) hydroxide. The crystal and molecular structure have been determined. Crystal data: space group P212121, Z = 4, a = 8.639 (1) Å, b = 14.358 (4) Å, c = 17.510 (3) Å, V = 2172 Å3, R = 3.9% for 1875 reflections. The copper environment is pseudotetrahedral, with a dihedral angle of 57.4° between the two CuN2 ligand planes. This accurate structure provides a new and somewhat better calibrant for the correlation between the spectra and structures of pseudotetrahedral copper(II) complexes than the known [Cu(HDPA)2] (ClO4)2 complex (2) (R = 9.4%), where HDPA = 2,2′-dipyridylamine. The differences between complexes 1 and 2 include a slightly closer approach to tetrahedral configuration of copper(II) in complex 1 and far greater deviation of the ligands from planarity in 2, as well as a major displacement of the metal atom from one of the ligand planes. Although the difference between the dihedral angles in the two complexes is small (57.4 and 55.6°), the trend is in the right direction when compared to spectral assignments. © 1979 American Chemical Society.



International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version


File Type





© 1979 American Chemical Society (ACS), All rights reserved.

Publication Date

01 Jan 1979