Comparison of Complexes with Anionic and Neutral Amide Groups

Alternative Title

Crystal and molecular structures of bis N-(2-pyridyl)acetamide complexes of Pd(II), Ni(II) and Zn(II)

Abstract

The crystal structure of the neutral complex Pd(aap) 2 of the title ligand shows a tetragonal Pd(II) with two trans ligands each chelated by the ring nitrogen and amide oxygen. The amide nitrogen is deprotonated and not coordinated. In the isomorphous M(aapH) 2(NO 3) 2 structures where M = Co(II), Ni(II), and Zn(II), there are two axial water molecules and again two trans ligands chelated as above but with a neutral amide nitrogen. For two of these complexes (M = Ni, Zn), the detailed molecular structures were determined. These complexes possess an amide CO bond 0.04 Å shorter and an amide CN bond 0.03 Å longer than are found in the Pd(aap) 2 complex. Crystal data for Pd(aap) 2: space group P2 1/n, Z = 2, a = 8.191(2), b = 4.859(1), c = 17.582(3) Å, β = 96.24(2)°, R = 3.2% for 1728 reflections. Crystal data for [Zn(aapH) 2(H 2O) 2](NO 3) 2: space group P2 1/n, Z = 2, a = 7.134(3), b = 10.266(6), c = 14.004(6) Å, β = 93.13(4)°, R = 6.0% for 1714 reflections. Crystal data for [Ni(aapH) 2(H 2O) 2](NO 3) 2: space group P2 1/n, Z = 2, a = 7.120(2), b = 10.170(2), c = 13.970(5) Å, β = 93.61(2)°, R = 3.2% for 1787 reflections. Crystal data for [Co(aapH) 2(H 2O) 2(NO 3) 2: space group P2 1/n, Z = 2, a = 7.113(6), b = 10.275(4), c = 14.045(7) Å, β = 93.6(1). © 1982.

Department(s)

Chemistry

International Standard Serial Number (ISSN)

0020-1693

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1982 Elsevier, All rights reserved.

Publication Date

01 Jan 1982

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