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Abstract: Two coordination polymers, namely, [Co(IM)6][Co2(SIP)3] (1) (IM=imidazole, H3SIP=5-sulfoisophthalic acid) and [BMIM]2[Cd2(SIP)3] (2) (BMIM=1-n-butyl-3-methylimidazolium) were synthesized in ionothermal reactions by using ionic liquid 1-n-butyl-3-methylimidazolium tetrafluoroborate as solvent. Single-crystal X-ray analyses revealed that 1 has an anionic 1D polymeric chain charge balanced by an uncommon [Co(IM)6]2+ cation. Complex 2 features an anionic 2D layer containing unique tetranuclear [Cd4(CO2)6(SO3)2] cluster wherein the four Cd atoms are co-planar. The imidazolium cation [BMIM]+ of the ionic liquid acting as charge compensating agent intercalated into the [Cd2(SIP)2]2n− interlayers in structure 2. The rich ionic environments of the ionic liquid may be particularly helpful in the formation of the anionic frameworks of 1 and 2. [Copyright &y& Elsevier]

Two isomorphous compounds [Eu(2,2′-bpdc)(NO3)(e-urea)3]n (1) and [Tb(2,2′-bpdc)(NO3)(e-urea)3]n (2) (2,2′-bpdc2−=2,2′-biphenyldicarboxylate and e-urea=ethyleneurea) have been synthesized using a deep-eutectic solvent of choline chloride/e-urea. The lanthanide ions are linked by the 2,2′-bpdc2− ligands to form one-dimensional helical chains in these compounds. Of special interest is the presence of parallel left- and right-handed single helices with the ratio of 1:1 in both compounds. Detailed photoluminescence studies show that both compounds exhibit typical lanthanide luminescent emissions and the excitation energy has been efficiently transferred to the lanthanide ions from the organic ligands. [ABSTRACT FROM AUTHOR]