Abstract
AbstractThe reactions of Ln(NO3)3 with 1,4‐phenylenediacetic acid (H2PDA) under hydrothermal conditions produced two isostructural lanthanide coordination polymers with the empirical formula [Ln2(PDA)3(H2O)]·2H2O [Ln = Nd (1), Sm (2)]. Single‐crystal X‐ray diffraction analyses revealed that both contain one‐dimensionalmetal carboxylato chains, which are further connected by the–CH2C6H4CH2– spacers of PDA2– ligands to yield a three‐dimensional metal‐organic framework. Magnetic susceptibilities of 1 and 2 were measured. The experimental χmT value of both compounds decreases continuously with decreasing temperature over the whole temperature range. The best least‐squares fit of the experimental data of 1 to a theoretical equation in the temperature range of 70–300 K gives the zero‐field splitting parameter Δ = 2.21 cm–1 and the magnetic interaction between the NdIII ions 2zJ′ = –1.97 cm–1, which indicates the presence of antiferromagnetic interaction between the NdIII ions. The experimental χmT value of 2 at 2 K is much smaller than the expected value for two free SmIII ions (6H5/2, g = 2/7) in the ground state, indicating that an antiferromagnetic interaction possibly exists between SmIII ions at low temperature. Fitting the magnetic data of 2 above 110 K based on an equation deduced from the SmIII ion in a monomeric system with free‐ion approximation gave a spin‐orbit coupling parameter λ = 192(2) cm–1
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