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A new series of heterolanthanide (III) -copper (I) wheel-cluster complexes Ln6 (micro3-O) 2 (IN) 18-Cu8 (micro4-I) 2 (micro2-I) 3. H3O (IN=isonicotinate; Ln=Y 1, Nd 2, Dy 3, Gd 4, Sm 5, Eu 6, Tb 7) were prepared by hydrothermal reaction at low pH. X-ray crystallographic studies reveal that two unusual trinuclear Ln3 (micro3-O) and tetranuclear Cu4 (micro4-I) cores are successfully used as secondary building units to make two different nanosized wheels Ln18 (micro3-O) 6 (CO2) 48 (6-), Ln18, and Cu24 (micro4-I) 6 (micro2-I) 126+, Cu24, with 12-rings and a diameter of 26. 7 and 26. 4 A, respectively. The wheels are further assembled into two-dimensional (2D) Ln18 and Cu24 networks, the linkages between two distinct layered networks of Ln18 and Cu24 wheels by IN pillars along the c axis giving a series of unprecedented three-dimensional (3D) sandwich frameworks. To our knowledge, compounds 1-7 are the first examples containing two different layered networks of nanosized Ln and transition metal (TM) wheels in wheel-cluster chemistry. The IR, UV/Vis, thermogravimetric analysis (TGA), luminescent, and magnetic properties of these complexes were also studied.
Cheng et al. (2007) studied this question.