Jump to main content
Jump to site search
SCHEDULED MAINTENANCE Close the message box

Maintenance work is planned for Monday 16 August 2021 from 07:00 to 23:59 (BST).

Website performance may be temporarily affected and you may not be able to access some PDFs or images. If this does happen, refreshing your web browser should resolve the issue. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 8, 1981

Synthesis of some pentagonal-bipyramidal complexes of manganese(II), iron(II), cobalt(II), nickel(II), copper(II), and zinc(II) with a heptadentate Schiff-base ligand and the crystal and molecular structures of a copper(II) complex

Abstract

Complexes of the type [ML]X2.xH2O, where M is a divalent metal ion (Mn, Fe, Co, Ni, CU, Zn), X = ClO4- or BPh4-, x= 0 or 1, and L is a potentially heptadentate Schiff base derived from the condensation of one molecule of 2,6-diacetylpyridine with two molecules of diethylenetriamine, are reported. The complexes were prepared by metal exchange from corresponding alkaline-earth metal complexes. By means of a single-crystal X-ray analysis of [CuL][ClO4]2, comparisons of X-ray powder patterns, and various physical properties it is shown that the complexes have a pentagonal-bipyramidal structure in the solid state and also, nickel(II) complexes excepted, in acetonitrile solution. Crystals of [CuL][ClO4]2, are monoclinic, with a= 12.18(1), b= 13.78(1), c= 14.92(1)Å, β= 98.3(1)°, Z= 4, space group P21/n. 1 486 Reflections above background have been measured by diffractometer and refined by full-matrix least squares to R 0.079. The three nitrogen atoms of the trimethine group together with the two secondary amine nitrogen atoms define the equatorial plane of a distorted pentagonal bipyramid, the primary amine nitrogen atoms occupying the axial positions. The Cu–Nax. bonds [1.993(19), 1.997(20)Å] are notably shorter than the Cu–Neq. bonds (average 2.356 Å). The transition-metal complexes are all high spin. Electronic spectra are reported, as well as the e.s.r. spectrum of [CuL][BPh4]2.

Article information


J. Chem. Soc., Dalton Trans., 1981, 1685-1690
Article type
Paper

Synthesis of some pentagonal-bipyramidal complexes of manganese(II), iron(II), cobalt(II), nickel(II), copper(II), and zinc(II) with a heptadentate Schiff-base ligand and the crystal and molecular structures of a copper(II) complex

M. G. B. Drew, J. Nelson and S. M. Nelson, J. Chem. Soc., Dalton Trans., 1981, 1685 DOI: 10.1039/DT9810001685

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.


Search articles by author

Spotlight

Advertisements