Crystal structures of [Ln(NO3)3(μ2-bpydo)2], whereLn= Ce, Pr or Nd, and bpydo = 4,4′-bipyridineN,N′-dioxide: layered coordination networks containing 44grids

Abstract

Three isostructural coordination networks of Ce, Pr, and Nd nitrate with 4,4′-bipyridineN,N′-dioxide (bpydo) are reported, namely poly[[tris(nitrato-κ2O,O′)cerium(III)]-bis(μ2-4,4′-bipyridineN,N′-dioxide-κ2N:N′)], [Ce(NO3)3(C10H8N2O2)2], poly[[tris(nitrato-κ2O,O′)praeseodymium(III)]-bis(μ2-4,4′-bipyridineN,N′-dioxide-κ2N:N′)], [Pr(NO3)3(C10H8N2O2)2], and poly[[tris(nitrato-κ2O,O′)neodymium(III)]-bis(μ2-4,4′-bipyridineN,N′-dioxide-κ2N:N′], [Nd(NO3)3(C10H8N2O2)2]. All three compounds are isostructural to the previously reported La analogue. The asymmetric unit of [Ln(NO3)3(μ2-bpydo)2] contains one lanthanide cation, two bpydo ligands, and three nitrate anions. Both bpydo ligands act as end-to-end μ2-bridges and display nearly idealcisandgaucheconformations, respectively. The bpydo ligands link the ten-coordinateLnIIIcations, forming interdigitating 44grid-like layers extending parallel to (-101), where interdigitation of layers is promoted by C—H...O interactions between nitrate anions and bpydo ligands. The interdigitated layers are linked to sets of neighboring layersviafurther C—H...O and π–π interactions.