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Moliner N, Salmon L, Capes L, Muñoz MC, Létard JF, Bousseksou A, Tuchagues JP, McGarvey JJ, Dennis AC, Castro M, Burriel R, Real JA. Thermal and Optical Switching of Molecular Spin States in the {[FeL[H2B(pz)2]2} Spin-Crossover System (L = bpy, phen). J Phys Chem B 2002. [DOI: 10.1021/jp013872b] [Citation(s) in RCA: 96] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nicolás Moliner
- Departament de Química Inorgánica/Institut de Ciencia Molecular, Universitat de València, Dr. Moliner 50, E-46100 Burjassot, València, Spain, Groupe des Sciences Moléculaires, Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS, 33608 Pessac, France, Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse, France, Departament de Física Aplicada, Universitat Politècnica de València, Camino de Vera s/n, 46071, València, Spain, School of Chemistry, The Queen's
| | - Lionel Salmon
- Departament de Química Inorgánica/Institut de Ciencia Molecular, Universitat de València, Dr. Moliner 50, E-46100 Burjassot, València, Spain, Groupe des Sciences Moléculaires, Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS, 33608 Pessac, France, Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse, France, Departament de Física Aplicada, Universitat Politècnica de València, Camino de Vera s/n, 46071, València, Spain, School of Chemistry, The Queen's
| | - Laurence Capes
- Departament de Química Inorgánica/Institut de Ciencia Molecular, Universitat de València, Dr. Moliner 50, E-46100 Burjassot, València, Spain, Groupe des Sciences Moléculaires, Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS, 33608 Pessac, France, Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse, France, Departament de Física Aplicada, Universitat Politècnica de València, Camino de Vera s/n, 46071, València, Spain, School of Chemistry, The Queen's
| | - M. Carmen Muñoz
- Departament de Química Inorgánica/Institut de Ciencia Molecular, Universitat de València, Dr. Moliner 50, E-46100 Burjassot, València, Spain, Groupe des Sciences Moléculaires, Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS, 33608 Pessac, France, Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse, France, Departament de Física Aplicada, Universitat Politècnica de València, Camino de Vera s/n, 46071, València, Spain, School of Chemistry, The Queen's
| | - Jean-François Létard
- Departament de Química Inorgánica/Institut de Ciencia Molecular, Universitat de València, Dr. Moliner 50, E-46100 Burjassot, València, Spain, Groupe des Sciences Moléculaires, Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS, 33608 Pessac, France, Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse, France, Departament de Física Aplicada, Universitat Politècnica de València, Camino de Vera s/n, 46071, València, Spain, School of Chemistry, The Queen's
| | - Azzedine Bousseksou
- Departament de Química Inorgánica/Institut de Ciencia Molecular, Universitat de València, Dr. Moliner 50, E-46100 Burjassot, València, Spain, Groupe des Sciences Moléculaires, Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS, 33608 Pessac, France, Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse, France, Departament de Física Aplicada, Universitat Politècnica de València, Camino de Vera s/n, 46071, València, Spain, School of Chemistry, The Queen's
| | - Jean-Pierre Tuchagues
- Departament de Química Inorgánica/Institut de Ciencia Molecular, Universitat de València, Dr. Moliner 50, E-46100 Burjassot, València, Spain, Groupe des Sciences Moléculaires, Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS, 33608 Pessac, France, Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse, France, Departament de Física Aplicada, Universitat Politècnica de València, Camino de Vera s/n, 46071, València, Spain, School of Chemistry, The Queen's
| | - John J. McGarvey
- Departament de Química Inorgánica/Institut de Ciencia Molecular, Universitat de València, Dr. Moliner 50, E-46100 Burjassot, València, Spain, Groupe des Sciences Moléculaires, Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS, 33608 Pessac, France, Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse, France, Departament de Física Aplicada, Universitat Politècnica de València, Camino de Vera s/n, 46071, València, Spain, School of Chemistry, The Queen's
| | - Andrew C. Dennis
- Departament de Química Inorgánica/Institut de Ciencia Molecular, Universitat de València, Dr. Moliner 50, E-46100 Burjassot, València, Spain, Groupe des Sciences Moléculaires, Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS, 33608 Pessac, France, Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse, France, Departament de Física Aplicada, Universitat Politècnica de València, Camino de Vera s/n, 46071, València, Spain, School of Chemistry, The Queen's
| | - Miguel Castro
- Departament de Química Inorgánica/Institut de Ciencia Molecular, Universitat de València, Dr. Moliner 50, E-46100 Burjassot, València, Spain, Groupe des Sciences Moléculaires, Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS, 33608 Pessac, France, Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse, France, Departament de Física Aplicada, Universitat Politècnica de València, Camino de Vera s/n, 46071, València, Spain, School of Chemistry, The Queen's
| | - Ramón Burriel
- Departament de Química Inorgánica/Institut de Ciencia Molecular, Universitat de València, Dr. Moliner 50, E-46100 Burjassot, València, Spain, Groupe des Sciences Moléculaires, Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS, 33608 Pessac, France, Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse, France, Departament de Física Aplicada, Universitat Politècnica de València, Camino de Vera s/n, 46071, València, Spain, School of Chemistry, The Queen's
| | - José Antonio Real
- Departament de Química Inorgánica/Institut de Ciencia Molecular, Universitat de València, Dr. Moliner 50, E-46100 Burjassot, València, Spain, Groupe des Sciences Moléculaires, Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 CNRS, 33608 Pessac, France, Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse, France, Departament de Física Aplicada, Universitat Politècnica de València, Camino de Vera s/n, 46071, València, Spain, School of Chemistry, The Queen's
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Matouzenko GS, Bousseksou A, Lecocq S, van Koningsbruggen PJ, Perrin M, Kahn O, Collet A. Polymorphism in Spin Transition Systems. Crystal Structure, Magnetic Properties, and Mössbauer Spectroscopy of Three Polymorphic Modifications of [Fe(DPPA)(NCS)(2)] [DPPA = (3-Aminopropyl)bis(2-pyridylmethyl)amine]. Inorg Chem 1997; 36:5869-5879. [PMID: 11670210 DOI: 10.1021/ic971174t] [Citation(s) in RCA: 96] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Three polymorphic modifications A-C of [Fe(II)(DPPA)(NCS)(2)], where DPPA = (3-aminopropyl)bis(2-pyridylmethyl)amine is a new tetradentate ligand, have been synthesized, and their structures, magnetic properties, and Mössbauer spectra have been investigated. For polymorph A, variable-temperature magnetic susceptibility measurements as well as Mössbauer spectroscopy have revealed the occurrence of a rather gradual HS if LS transition without hysteresis, centered at about 176 K. The same methods have shown that polymorph B is paramagnetic over the temperature range 4.5-295 K, whereas polymorph C exhibits a very abrupt S = 2 if S = 0 transition with a hysteresis. The hysteresis width is 8 K, the transitions being centered at T(c) downward arrow = 112 K for decreasing and T(c) upward arrow = 120 K for increasing temperatures. The crystal structures of the three polymorphs have been solved by X-ray diffraction at 298 K. Polymorph A is triclinic, space group P&onemacr; with Z = 2, a = 8.710(2) Å, b = 15.645(2) Å, c = 7.985(1) Å, alpha = 101.57(1) degrees, beta = 112.59(2) degrees, and gamma = 82.68(2) degrees. Polymorph B is monoclinic, space group P2(1)/c with Z = 4, a = 8.936(2) Å, b = 16.855(4) Å, c = 13.645(3) Å, and beta = 97.78(2) degrees. Polymorph C is orthorhombic, space group Pbca with Z = 8, a = 8.449(2) Å, b = 14.239(2) Å, and c = 33.463(5) Å. In the three polymorphs, the asymmetric units are almost identical and consist of one chiral complex molecule with the same configuration and conformation. The distorted [FeN(6)] octahedron is formed by four nitrogen atoms belonging to DPPA and two provided by the cis thiocyanate groups. The two pyridine rings of DPPA are in fac positions. The main differences between the structures of the three polymorphs are found in their crystal packing. The stabilization of the high-spin ground state of polymorph B is tentatively explained by the presence of two centers of steric strain in the crystal lattice resulting in the elongation of the Fe-N(aromatic) distance. The observed hysteresis in polymorph C seems to be due to the existence of an array of intermolecular contacts in the crystal lattice making the spin transition more cooperative than in polymorph A.
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Affiliation(s)
- Galina S. Matouzenko
- Stéréochimie et Interactions moléculaires (UMR CNRS and ENS-Lyon No. 117; chaire de l'Institut universitaire de France), École normale supérieure de Lyon, 46, allée d'Italie, 69364 Lyon cedex 07, France, Laboratoire de chimie de coordination (UPR CNRS No. 8241), 205, route de Narbonne, 31077 Toulouse cedex, France, and School of Chemistry, Queen's University of Belfast, Belfast, BT9 5AG, Northern Ireland, Laboratoire de reconnaissance et organisation moléculaire (ESA Q5078), Université Claude Bernard-Lyon 1, 69622 Villeurbanne cedex, France, and Laboratoire des sciences moléculaires, Institut de chimie de la matière condensée de Bordeaux (UPR CNRS No. 9048), 33608 Pessac, France
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Matouzenko GS, Bousseksou A, Lecocq S, van Koningsbruggen PJ, Perrin M, Kahn O, Collet A. Spin Transition in [Fe(DPEA)(NCS)(2)], a Compound with the New Tetradentate Ligand (2-Aminoethyl)bis(2-pyridylmethyl)amine (DPEA): Crystal Structure, Magnetic Properties, and Mössbauer Spectroscopy. Inorg Chem 1997; 36:2975-2981. [PMID: 11669946 DOI: 10.1021/ic9615133] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The new spin transition compound [Fe(II)(DPEA)(NCS)(2)], where DPEA [(2-aminoethyl)bis(2-pyridylmethyl)amine] is a new tetradentate ligand, has been synthesized, and its structure, magnetic properties, and Mössbauer spectra have been investigated. The crystal structure has been determined by X-ray diffraction at 298 K. The compound crystallizes in the monoclinic system, space group is P2(1)/c, with Z = 4,a = 9.358(1) Å, b = 11.812(2) Å, c = 17.135(2) Å, and beta = 94.5(4) degrees. The distorted [FeN(6)] octahedron is formed from four nitrogen atoms belonging to DPEA and two provided by the cis thiocyanate groups. The two pyridine rings of DPEA are in mer positions. Each molecule is linked to its neighbors by hydrogen-bonding interactions as well as by numerous van der Waals contacts supposed to be responsible for the cooperativity of the system. Variable-temperature magnetic susceptibility measurements (20-290 K) have evidenced a relatively abrupt S = 2 right harpoon over left harpoon S = 0 transition centered at T(1/2) = 138 K. The thermal variation of the high spin state fraction observed by Mössbauer spectroscopy is in agreement with that obtained from magnetic susceptibility measurements. The fitting of Mössbauer and magnetic data with the Ising-like model allowed us to determine the energy gap between the high-spin and low-spin states (Delta(eff) = 835 K) and to estimate the variation of the thermodynamic parameters upon spin transition. The calculated variations of enthalpy (DeltaH = 6.76 kJ mol(-)(1)) and entropy (DeltaS = 49 J mol(-)(1) K(-)(1)) associated with the spin transition are in agreement with those previously observed for iron(II) spin-crossover compounds. The spin conversion is found to be close to a first-order phenomenon.
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Affiliation(s)
- Galina S. Matouzenko
- Laboratoire de stéréochimie et interactions moléculaires, École normale supérieure de Lyon, 46, allée d'Italie, 69364 Lyon cedex 07, France, Laboratoire de chimie de coordination du CNRS, 205, route de Narbonne, 31077 Toulouse cedex, France, Laboratoire de reconnaissance et organisation moléculaire, Université Claude Bernard-Lyon 1, 69622 Villeurbanne cedex, France, and Laboratoire des sciences moléculaires, Institut de chimie de la matière condensée de Bordeaux, 33608 Pessac, France
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