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Three new hybrid mercury halides compounds with 1,4-diazabicyclo[2.2.2]octan (DABCO) ligand, namely, Hg 2 (μ 2 -I) 2 I 3 (H-DABCO) ( 1 ), {[Hg 5 (μ 2 -I) 6 I 4 (μ 2 -DABCO) 2 ][Hg 2 I 4 (μ 2 -DABCO)]} n ( 2 ) and {[Hg 2 (μ 2 -Br) 2 Br 2 (μ 2 -DABCO)]·2(HgBr 2 )} n ( 3 ), have been synthesized. Compound 1 crystallizes in a P 2 1 chiral space group and is a discrete dinuclear mercury(II) compound with inorganic Hg 2 (μ 2 -I) 2 I 3 unit. Compound 2 consists of 1D neutral [Hg 5 (μ 2 -I) 6 I 4 (μ 2 -DABCO) 2 ] n broad polymeric array containing uncommon inorganic decanuclear [Hg 10 (μ 2 -I) 12 I 8 ] n clusters, and neutral guest Hg 2 (μ 2 -DABCO)I 4 molecules. Compound 3 is composed of a neutral [Hg 2 (μ 2 -Br) 2 Br 2 (μ 2 -DABCO)] n polymeric chain and guest inorganic HgBr 2 molecules. In all cases, the halide ions participate in the framework connectivity as bridging ligands. A variety of coordination geometries displayed by the metal sites such as linear, trigonal and tetrahedral are observed in these compounds. Of the three compounds, only compound 3 displays photoluminescence with a emission maximum at 528 nm upon excitation at 468 nm. In addition, these compounds are characterized by IR, elemental analysis, and thermogravimetric analysis.

Three new coordination compounds with 4-sulfophthalic acid (H3SPA) ligand, namely {[Pb3(4-SPA)2(H2O)](H2O)}n (1), [Mn(4,4′-bpy)2(H2O)4][Mn2(4-SPA)2-(4,4′-bpy)4(H2O)4]·7.5(H2O) (2) and Cu2(4-HSPA)2(2,2′-bpy)2(H2O)2 (3) (4,4′-bpy = 4,4′-bipyridine and 2,2′-bpy = 2,2′-bipyridine), have been synthesized. The structures exhibit different dimensionality depending on the nature of the metal ions and/or the ancillary ligands. Compound 1 has a 2D layered architecture constructed from one-dimensional inorganic lead(II) oxygen chains containing tetranuclear [Pb4(μ2-O)4] cluster. Compound 2 has a dinuclear manganese [Mn2(4-SPA)2(4,4′-bpy)4(H2O)4] motif charged with mononuclear [Mn(4,4′-bpy)2(H2O)4]2+ cation. Compound 3 is a discrete dinuclear copper(II) structure that linked by extensive hydrogen bonds to form a three-dimensional supramolecular structure. In the solid state, compound 1 exhibits blue photoluminescence with the maximum at 432 nm upon excitation at 350 nm. The temperature-dependent magnetic susceptibility data of 2 have been investigated. The Curie constant C and Weiss constant θ are 3.14 emu K mol−1 and −2.09 K, respectively, revealing antiferromagnetically magnetic interactions between the Mn2+ ions. In addition, these compounds are characterized by powder X-ray diffraction, IR, elemental analysis, and thermogravimetric analysis.

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.