A Family of Three-Dimensional Lanthanide-Zinc Heterometal–Organic Frameworks from 4,5-Imidazoledicarboxylate and Oxalate Zhi-Gang Gu Hua-Cai Fang Pei-Yi Yin Long Tong Yin Ying She-Jun Hu Wei-Shan Li Yue-Peng Cai 10.1021/cg1015753.s001 https://acs.figshare.com/articles/journal_contribution/A_Family_of_Three_Dimensional_Lanthanide_Zinc_Heterometal_Organic_Frameworks_from_4_5_Imidazoledicarboxylate_and_Oxalate/2646133 A family of lanthanide-zinc coordination polymers with two different types of three-dimensional (3-D) frameworks based on 4,5-imidazoledicarboxylic acid and oxalic acid, namely, {[Ln<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>Zn<sub>4</sub>(H<sub>2</sub>O)<sub>4</sub>(ImDC)<sub>4</sub>(ox)]·6H<sub>2</sub>O}<i><sub>n</sub></i> (Ln = La (<b>1</b>), Nd (<b>2</b>), Sm (<b>3</b>), Eu (<b>4</b>), and H<sub>3</sub>ImDC = 4,5-imidazoledicarboxylic acid, H<sub>2</sub>ox = oxalic acid) and {[Ln<sub>4</sub>(H<sub>2</sub>O)<sub>4</sub>Zn<sub>4</sub>(H<sub>2</sub>O)<sub>4</sub>(ImDC)<sub>4</sub>(ox)]·2CH<sub>3</sub>OH·2H<sub>2</sub>O}<i><sub>n</sub></i> (Ln = Eu (<b>4</b>′), Gd (<b>5</b>), Dy (<b>6</b>), Ho (<b>7</b>), Er (<b>8</b>), Yb (<b>9</b>), and Lu (<b>10</b>)), were successfully constructed under certain conditions and characterized by elemental analysis, IR, thermogravimetric (TG), and single-crystal X-ray diffraction. The results reveal that compounds <b>1</b>–<b>4</b> (<b>I</b> structure) are isomorphous 3-D coordination frameworks containing two-dimensional (2-D) [Zn<sub>2</sub>(ImDC)<sub>2</sub>] layers and one-dimensional (1-D) Ln<sub>2</sub>(μ<sub>2</sub>-O)<sub>2</sub>(ox) sine wave-like chains with 1-D square channels, while <b>4′</b>–<b>10</b> coordination polymers (<b>II</b> structure) are also isomorphous and feature 3-D pillar-layered coordination frameworks constructed from 2-D Zn-carboxylate [Zn<sub>2</sub>(ImDC)<sub>2</sub>] layers and Ln<sub>2</sub>(ox) pillars with 1-D flat channels. The structural variation from <b>I</b> to <b>II</b> with the europium ion as a critical point, in which two types of europium complexes <b>4</b> and <b>4</b>′ can reversibly transform into each other, may be attributed to the lanthanide contraction effect. Meanwhile, the adsorption and photoluminescent properties of the partial compounds are also investigated. 2011-06-01 00:00:00 lanthanide contraction effect coordination framework europium complexes 4 oxalic acid Ln TG IR II