Influence of Substituents in the Aromatic Fragment of the Benzoate Anion on the Structures and Compositions of the Formed {Cd–Ln} Complexes

Abstract The reactions of Cd(NO 3 ) 2 ∙ 4H 2 O and Eu(NO 3 ) 3 ∙ 6H 2 O with potassium salts of the benzoic acid derivatives and 2,2'-bipyridine (Bipy) in ethanol, under the same synthesis conditions, afford the homo- and heterometallic complexes: [Eu 2 Cd 2 (BA) 8 (NO 3 ) 2 (Bipy) 2 ] ( I , BA is benzoic acid anion), [Ln 2 Cd 2 (4-TBA) 10 (Bipy) 2 ] (Ln = Eu ( II ), Tb ( III ); 4-TBA is 4-(trifluoromethyl)benzoic acid anion), [Cd(4-CBA) 2 (H 2 O)(Bipy)] ( IV , 4-CBA is 4-cyanobenzoic acid anion), [Cd(PFBA) 2 (H 2 O)(Bipy)] n ( V , PFBA is pentafluorobenzoic acid anion), and [Cd 2 (4-APFBA) 4 (Bipy) 2 ] ∙ 4H 2 O ( VI , 4-ATFBA is 4-amino-2,3,5,6-tetrafluorobenzoic acid anion). The structures of new complexes I , II , IV , and VI are determined by X-ray structure analysis (CIF files CCDC nos. 1970348, 1970350, 1970347, and 1970351, respectively). The isostructural character of complexes II and III is confirmed by X-ray diffraction analysis. The structures and compositions of the series of isolated compounds I – VI are determined by the nature of substituents in the benzoate anion. The photoluminescence properties of compounds II and III are studied.