Crystal Structure of Gadolinium 3,5-Dinitrobenzoate Dihydrate

Abstract

Rare earth carboxylates may have chelating, bridging and chelating-bridging modes of coordination simultaneously or separatively.1-5 The title compound, catena- 6 ]·2H 2 O, was synthesized in order to study the structure and to determine the mode of coordination around Gd.In a mole ratio of 1:1, 3,5-dinitrobenzoic acid and NaHCO 3 were added into hot distilled water and stirred by a magnetic stirrer until complete dissolution. A solution containing Gd 3+ was prepared by dissolving an appropriate quantity (1:3 mol of 3,5-dinitrobenzoic acid) of the Gd(NO 3 ) 3 ·6H 2 O (prepared from metallic Gd) in 10 ml of water. Within two weeks, crystals were obtained by slow evaporation of the filtered final solution. A chemical diagram of the title compound is shown in Fig. 1.The coordination around a Gd ion is eightfold (Fig. 2)

Structures, luminescence and vibrational spectroscopy of europium and terbium nitro- and dinitro-substituted benzoates. Nitro groups as quenchers of Ln3+ luminescence

“…The majority of known structures of binary nitrobenzoates of lanthanides relating to the middle of lanthanide row has a coordination polymer structure like europium 3-nitrobenzoate methanol solvate (KENROL [1]), europium and terbium 4-nitrobenzoates (KENRUR [1], LESMOL01 [1], LESMOL [21]), and samarium and gadolinium 3,5-dinitrobenzoates (SUVXIQ, QAWNUX [22,23]). Europium 2-nitrobenzoate methanol solvate (KENSAY [1]) has molecular dimeric structure with two nonequivalent Eu 3+ ions.…”