Novel mononuclear and 1D-polymeric derivatives of lanthanides and (η6-benzoic acid)tricarbonylchromium: synthesis, structure and magnetismElectronic supplementary information (ESI) available: CIF files of the structural data for compounds 1, 2, 3a, 4a, Eu_1D, 4b, 5b, and 8 and data collection and structure refinement statistics. CCDC 1519452-1519455 (Eu_1D, 4b, 5b, 8) and 1519456-1519459 (1, 2, 3a, 4a). For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c6dt0489

Two series of novel heteroleptic derivatives of lanthanides and (η 6 -benzoic acid)tricarbonylchromium (benchrotrenecarboxylic acid) were synthesized and characterized: mononuclear complexes [Ln(BcrCOO)(acac) 2 (H 2 O) 2 ] (Ln = Eu ( 1 ), Gd ( 2 ), Tb ( 3a ), Dy ( 4a ), Ho ( 5a )) and 1D-polymeric ones [Ln(BcrCOO)(acac) 2 (H 2 O)] n (Ln = Tb ( 3b ), Dy ( 4b ), Ho ( 5b ), Er ( 6 ), Tm ( 7 ), Yb ( 8 ) and Y ( 9 )), Bcr = (η 6 -C 6 H 5 )Cr(CO) 3 . The molecular and crystal structures of the obtained compounds were determined. Complexes 3a , 4a , 4b , 6 and 8 were found to exhibit SMM properties. Two maxima were observed on χ ′′( ν ) dependencies (LF and HF) for 4a , 4b and 6 . For 4a , the anisotropy barriers are Δ eff / k B = 100 K and 118 K in zero dc-field (128 K and 143 K in 2000 Oe field) for the LF (low frequency) and HF (high frequency) signals, respectively. These values are the highest ones for Ln carboxylate complexes. The nature of the appearance of two maxima in the system is discussed. Novel derivatives of lanthanides and (η 6 -benzoic acid)tricarbonylchromium were synthesized and characterized; complexes of Tb, Dy, Er and Yb exhibit SMM behavior.