title: Novel mononuclear and 1D-polymeric derivatives of lanthanides and (η6-benzoic acid)tricarbonylchromium: synthesis, structure and magnetism.
abstract: Two series of novel heteroleptic derivatives of lanthanides and (η6-benzoic acid)tricarbonylchromium (benchrotrenecarboxylic acid) were synthesized and characterized: mononuclear complexes [Ln(BcrCOO)(acac)2(H2O)2] (Ln = Eu (1), Gd (2), Tb (3a), Dy (4a), Ho (5a)) and 1D-polymeric ones [Ln(BcrCOO)(acac)2(H2O)]n(Ln = Tb (3b), Dy (4b), Ho (5b), Er (6), Tm (7), Yb (8) and Y (9)), Bcr = (η6-C6H5)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 Δeff/kB= 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.
authors.affiliation: N.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky prosp. 31, 119991 Moscow, Russian Federation. penguin1990@yandex.ru nnefimov@narod.ru.
authors.forename: Andrey V
authors.initials: AV
authors.lastname: Gavrikov
authors.affiliation: N.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky prosp. 31, 119991 Moscow, Russian Federation. penguin1990@yandex.ru nnefimov@narod.ru.
authors.forename: Pavel S
authors.initials: PS
authors.lastname: Koroteev
authors.affiliation: N.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky prosp. 31, 119991 Moscow, Russian Federation. penguin1990@yandex.ru nnefimov@narod.ru.
authors.forename: Nikolay N
authors.identifier: http://orcid.org/0000-0003-4651-7948
authors.initials: NN
authors.lastname: Efimov
authors.affiliation: N.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky prosp. 31, 119991 Moscow, Russian Federation. penguin1990@yandex.ru nnefimov@narod.ru.
authors.forename: Zhanna V
authors.initials: ZV
authors.lastname: Dobrokhotova
authors.affiliation: N.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky prosp. 31, 119991 Moscow, Russian Federation. penguin1990@yandex.ru nnefimov@narod.ru.
authors.forename: Andrey B
authors.initials: AB
authors.lastname: Ilyukhin
authors.affiliation: School of Chemistry and Photon Science Institute, The University of Manchester, Manchester, M13 9PL, UK.
authors.forename: Andreas K
authors.initials: AK
authors.lastname: Kostopoulos
authors.affiliation: School of Chemistry and Photon Science Institute, The University of Manchester, Manchester, M13 9PL, UK.
authors.forename: Ana-Maria
authors.initials: AM
authors.lastname: Ariciu
authors.affiliation: N.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky prosp. 31, 119991 Moscow, Russian Federation. penguin1990@yandex.ru nnefimov@narod.ru.
authors.forename: Vladimir M
authors.initials: VM
authors.lastname: Novotortsev