Novel lanthanide(iii) coordination networks based on 1,2-bis(4-pyridyl)ethane-N,N′-dioxide and trans-1,2-bis(4-pyridyl)ethene-N,N′-dioxide?

New Journal of Chemistry Pub Date: 2002-05-13 DOI: 10.1039/B111660F

Abstract

The new ligand 1,2-bis(4-pyridyl)ethane-N,N′-dioxide (L) was used to generate five lanthanide(III) coordination networks of three structural types: (i) the isomorphous pair {[Ln(L)3]·(ClO4)3·(H2O)}∞ (Ln?=?Er, 1; Yb, 2) comprises two interpenetrating α-polonium nets in which each lanthanide(III) ion is in a rare homoleptic distorted octahedral coordination environment; (ii) an unprecedented mat-like pattern of three interwoven (6,3) nets is found in isomorphous {[Ln(NO3)3(L)1.5]·H2O}∞ (Ln?=?Er, 3; Yb, 4); (iii) {[La(NO3)3(L) (CH3OH)]· CH3OH·CH2Cl2}∞, 5, is built of an offset stacking of distorted square grids. The complex [Er(L′)0.5(H2O)3(C2O4)](ClO4)·L′·6H2O·(dioxane)0.5 (L′?=?trans-1,2-bis(4-pyridyl)ethene-N,N′-dioxide), 6, is composed of (6,3) nets in which the Er(III) ions are bridged by both L′ ligands and oxalate ions.

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