Cd(II) and Cd(II)–Eu(III) Complexes with Pentafluorobenzoic Acid Anions and N-Donor Ligands: Synthesis and Structures

The reactions of cadmium(II) and europium(III) pentafluorobenzoates ([Cd(Pfbz) ( H_2O)_4^ + n ∙ n (Pfbz) – ] ( I ) and [Eu 2 (Pfbz) 6 (H 2 O) 8 ] ∙ 2H 2 O ( II ), respectively; Pfbz is pentafluorobenzoic acid anion) with the N-donor ligands (pyridine (Py), 2-phenylpyridine (Phpy), and 3-ethynylpyridine (Etypy)) afford a series of new Cd–Ln complexes with Pfbz – anions and Py or its substituted analogues: [Cd 2 Eu 2 (Pfbz) 10 (Py) 4 ] ( III ), [Cd 2 Eu 2 (Pfbz) 10 (Phpy) 2 (MeCN) 2 ] · 5MeCN ( IV ), and [CdEu 2 (Pfbz) 8 (Etypy)(H 2 O) 2 ] n ∙ 3 n MeCN ∙ n (Etypy) ( VI ). Similar reactions of compounds I and II with 2,4-lutidine (Lut), isoquinoline (Iquin), 2,2'-biquinoline (Biquin), and 7,8-benzoquinoline (Bquin) give the following cadmium complexes as the major products of crystallization from the reaction solutions: [Cd(Pfbz) 2 (Lut)] n ( V ), [Cd(H 2 O)(Pfbz) 2 (Iquin) 2 ] n ( VII ), [Cd(Рfbz) 2 (Biquin)] ( VIII ), and [Cd(Pfbz)_3]_n^- ∙ n (HBquin) + ( IX ), respectively. The X-ray diffraction data (CIF files CCDC nos. 1987805 ( I ), 1987808 ( III ), 1987829 ( IV ), 1987817 ( V ), 1987822 ( VI ), 1987823 ( VII ), 1987824 ( VIII ), and 1987826 ( IX )) are examples of the formation of new unusual coordination polymers.