SYNTHESIS AND COMPLEXATION OF 1,2-BIS[(MONOAZA[15]CROWN-5)-N-YL]GLYOXIME - CRYSTAL-STRUCTURE OF (1,2-BIS[(MONOAZA[15]CROWN-5)-N-YL]GLYOXIMATO)PALLADIUM(II)

A new vicinal dioxime ligand with two crown‐ether groups, 1,2‐bis[(monoaza[15]crown‐5)‐N‐Yl]‐glyoxime(LH2), has been prepared from cyanogen di‐N‐oxide and monoaza[15]crown‐5. Ni(II), Pd(II), and Pt(IV) complexes of LH2 with or without alkali‐metal ions bound to macrocyclic groups have been isolated. The high affinity of [Pd(LH)2] and [Ni(LH)2] for the K+ ion is observed in solvent extraction experiments. A single‐crystal X‐ray structure confirms the postulated geometry of [Pd(LH)2]‐ The Pd‐atom of the centro‐symmetric molecule has square‐planar PdN4 coordination where Pd–N distances range from 1.978(3) to 1.970(3) Å. The N–Pd–N intraligand angle is 79.9(1)°. Copyright © 1990 Verlag GmbH & Co. KGaA, Weinheim