Unprecedented NaI–CuII–LnIII heterometallic coordination polymers based on 3,5-pyrazoledicarboxylate with both infinite cationic and anionic chains

Abstract

The self-assembly of 3,5-pyrazoledicarboxylic acid (H₃pdc) and metal salts under hydrothermal conditions leads to the formation of a series of novel Na^I–Cu^II–Ln^III heterometallic coordination polymers, {[Na(H₂O)₄]₂[Cu(pdc)₂Ln(H₂O)₅]₂·3H₂O}_n [Ln = La (1); Sm (2); Pr (3); Nd (4) and pdc³⁻ = 3,5-pyrazoledicarboxylate]. X-Ray structure analyses show that these complexes all exhibit pairs of infinite, unexpected, cationic and anionic chains. It is the first successful attempt to construct unprecedented Na^I–Cu^II–Ln^III heterometallic coordination polymers with both infinite cationic and anionic chains. These four complexes show homologous thermal stabilities. The different magnetic properties of 1–3 are also been reported in this paper.