Crystal structure and cryomagnetic study of a mononuclear erbium(III) oxamate inclusion complex

The synthesis, crystal structure and magnetic properties of an oxamate-containing erbium(III) complex, namely, tetrabutylammonium aqua[ N -(2,4,6-trimethylphenyl)oxamato]erbium(III)–dimethyl sulfoxide–water (1/3/1.5), (C 16 H 36 N)[Er(C 11 H 12 NO 3 ) 4 (H 2 O)]·3C 2 H 6 OS·1.5H 2 O or n -Bu 4 N[Er(Htmpa) 4 (H 2 O)]·3DMSO·1.5H 2 O ( 1 ), are reported. The crystal structure of 1 reveals the occurrence of an erbium(III) ion, which is surrounded by four N -phenyl-substituted oxamate ligands and one water molecule in a nine-coordinated environment, together with one tetrabutylammonium cation acting as a counter-ion, and one water and three dimethyl sulfoxide (DMSO) molecules of crystallization. Variable-temperature static (dc) and dynamic (ac) magnetic measurements were carried out for this mononuclear complex, revealing that it behaves as a field-induced single-ion magnet (SIM) below 5.0 K.