A series of complexes with a [Mn8O8]8+ saddle-like core: Facile synthesis, crystal structure and magnetic property

✍ Scribed by Hui-Sheng Wang; Cheng-Bing Ma; Mei Wang; Chang-Neng Chen; Qiu-Tian Liu

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 526 KB
• Volume: 875
• Category: Article
• ISSN: 0022-2860
• DOI: 10.1016/j.molstruc.2007.04.044

✦ Synopsis

Three manganese complexes formulated as ½Ce IV Mn III 8 O 8 (O 2 CMe) 12 (H 2 O) 4 ]AE4H 2 O (1AE4H 2 O), ½Ce IV Mn III 8 O 8 (O 2 CMe) 12 (py) 3

) (where py = pyridine, bzd = benzimidazole), have been synthesized and characterized by elemental analysis, IR and single-crystal X-ray diffraction analyses. Complexes 1-3 all consist of a central Ce 4+ ion surrounded by a nonplanar, saddle-like [Mn 8 O 8 ] 8+ loop via eight l 3 AO 2À ions, and peripheral ligation is provided by twelve acetate groups, four water molecules for complex 1, twelve acetate groups, three pyridines and one water molecule for complex 2, twelve acetate groups, two benzimidazoles and two water molecules for complex 3. Variable-temperature magnetic susceptibility measurements reveal the ground-state spin (S) values of 8 for complexes 1 and 2, which are half of the analogous complex previously reported. An explanation for this difference is also included in the text.