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

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.