Novel lanthanide(III) coordination networks based on 1,2-bis(4-pyridyl)ethane-N,N'-dioxide and tran-1,2-bis(4-pyridyl)ethene-N,N'-dioxide

摘要

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]·(ClO_4)_3·(H_2O)}_infinity (Ln = Er, 1; Yb, 2) comprises two interpenetrating alpha-polonium nets in which each lanthanide(III) ion is in a rare homoleptic distored octahedral coordination environment; (ii) an unprecedented mat-like pattern of three interwoven (6,3) nets is found in isomorphous {[Ln(NO_3)_3(L)_1.5]·H_2O}_infinity (Ln = Er, 3; Yb, 4); (iii) {[La(NO_3)_3(L)(CH_3OH)]·CH_3OH·CH_2Cl_2}_infinity, 5, is built of an offset stacking of distorted square grids. The complex [Er(L')_0.05(H_2O)_3(C_2O)_4]·L'·6H_2O·(dioxane)_0.5 (L' = trans-1,2-bis(4-pyridyl)ethene-N,N'-dioxide), 6, is compoed of (6,3) nets in which the Er(III) ions are bridged by both L' ligands and oxalate ions.