scholarly journals Magnetostructural Studies on Zigzag One-Dimensional Coordination Polymers Formed by Tetraamidatodiruthenium(II,III) Paddlewheel Units Bridged by SCN Ligands

2019 ◽  
Vol 5 (3) ◽  
pp. 40 ◽  
Author(s):  
Sara Moreno-Da Silva ◽  
Patricia Delgado-Martínez ◽  
Miguel Cortijo ◽  
Rodrigo González-Prieto ◽  
José Luis Priego ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Coordination Polymers ◽  
Ground State ◽  
Magnetic Data ◽  
Zero Field ◽  
Donor Atom ◽  
Zero Field Splitting ◽  
One Dimensional ◽  
Linkage Isomerism ◽  
New Compounds

We report herein on three zigzag one-dimensional coordination polymers of {[Ru2(μ-NHOCR)4](μ-SCN)}n (R = o-Me-C6H4 (2), m-Me-C6H4 (3), p-Me-C6H4 (4)) formula. These new compounds have been obtained by reaction of the corresponding [Ru2(μ-NHOR)4(THF)2](BF4) complex with (NBu4)(SCN) under different synthetic conditions. The crystal structure of [Ru2(μ-NHOCC6H4-o-Me)4(THF)2](BF4) (1), 2 and 3 are presented. A cis-(2,2) arrangement of the amidate ligands of the [Ru2(μ-NHOCR)4]+ units is observed in all cases. Interestingly, the structures of 2 and 3 show linkage isomerism in alternated tetraamidatodiruthenium units whose axial positions are occupied by the same type of donor atom of the SCN ligands. This results in zigzag chains with a Ru-S-C angle of 98.97° and Ru-N-C angle of 169.36° in the case of 2 and 97.99° and 159.26°, respectively, in the case of 3. The magnetic data obtained for 2–4 are indicative of a σ2π4δ2(π*δ*)3 ground state (S = 3/2) and a large zero-field splitting (ZFS) in all cases (D = 54.57, 62.72 and 43.00 cm−1 for 2–4, respectively). Similar small antiferromagnetic interactions between diruthenium units (zJ = −0.93, −0.79 and −1.11 cm−1 for 2–4, respectively) are estimated for all the polymers, suggesting an analogous zigzag arrangement of the chains for 4.

Non-traditional thermal behavior of Co(II) coordination networks showing slow magnetic relaxation

2021 ◽  
Author(s):  
Anna Switlicka ◽  
Barbara Machura ◽  
Alina Bieńko ◽  
Dariusz Bieńko ◽  
Cyril Rajnák ◽  
...  
Keyword(s):  
Thermal Behavior ◽  
Coordination Polymers ◽  
Spin System ◽  
Magnetic Relaxation ◽  
Magnetic Data ◽  
Zero Field ◽  
Two Dimensional ◽  
Coordination Networks ◽  
One Dimensional ◽  
Slow Magnetic Relaxation

Three new coordination polymers, one-dimensional ones [Co(5,6-(Me)2–bzim)2(dca)2] (1), [Co(5-Mebzim)2(dca)2]n (2) and two-dimensional polymer [Co(2-Mebzim)(dca)2]n (3), show DC magnetic data consistent with the S = 3/2 spin system with large zero-field...

A new one-dimensional thiocyanato-bridged bimetallic compound [Cu(en)2Mn(NCS)4(H2O)2]n. Synthesis, crystal structure, and magnetic properties

1998 ◽  
Vol 76 (7) ◽  
pp. 1102-1107 ◽  
Author(s):  
Hui-Zhong Kou ◽  
Dai-Zheng Liao ◽  
Peng Cheng ◽  
Zong-Hui Jiang ◽  
Shi-Ping Yan ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Antiferromagnetic Interaction ◽  
Zero Field ◽  
Spin Multiplicity ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Coordination Environment ◽  
One Dimensional ◽  
D Model ◽  
Splitting Effect

A bimetallic compound [Cu(en)2Mn(NCS)4(H2O)2]n (en = ethylenediamine) has been prepared and its structure determined. It crystallizes in space group , with a = 7.432(1), b = 7.492(1), c = 9.751(2) Å, α = 91.00(3)°, ß = 99.14(3)°, γ = 112.51(3)°, and Z = 1. The structure consists of one-dimensional chains in which alternating Mn(II) and Cu(II) ions are bridged by NCS ligands. The coordination environment is octahedral for Mn(II) and elongated octahedral for Cu(II). From magnetic susceptibility measurements the compound was found to exhibit a ground state of low-spin multiplicity. Comparison between theory and experimental has been made using 1-D model and taking into account the zero-field splitting effect. The decrease in chimT observed at low temperature for the compound is attributed to a dominant zero-field splitting of the single Mn(II) ions with a weak antiferromagnetic interaction superimposed between the Mn(II) ions via the NCS-Cu-SCN pathway within each chain. Key words: crystal structure, copper(II) complexes, manganese(II) complexes, thiocyanate bridges, bimetallic complexes.

Zero field splitting of the Mo3+ ground state in corundum

1981 ◽  
Vol 107 (2) ◽  
pp. K129-K132
Author(s):  
M. Baran ◽  
A. A. Mirzakhanyan ◽  
E. G. Sharoyan ◽  
H. Szymczak
Keyword(s):  
Ground State ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting

Zero-Field Splitting of the Ground State S Ion in Calcite Type Borates

1979 ◽  
pp. 295-295
Author(s):  
A. Chlystov ◽  
S. Lukin ◽  
V. Rudenko ◽  
V. Seleznev ◽  
G. Tsintsadze
Keyword(s):  
Ground State ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting

ChemInform Abstract: THE GROUND STATE AND ZERO-FIELD SPLITTING OF THE GADOLINIUM OXIDE (GDO) MOLECULE

1982 ◽  
Vol 13 (7) ◽  
Author(s):  
R. J. VAN ZEE ◽  
R. F. FERRANTE ◽  
K. J. ZERINGUE ◽  
W. JUN. WELTNER
Keyword(s):  
Ground State ◽  
Gadolinium Oxide ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting

The ground state and zero‐field splitting of the GdO molecule

1981 ◽  
Vol 75 (11) ◽  
pp. 5297-5299 ◽  
Author(s):  
R. J. Van Zee ◽  
R. F. Ferrante ◽  
K. J. Zeringue ◽  
W. Weltner
Keyword(s):  
Ground State ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting

π–d INTERACTION BASED MOLECULAR CONDUCTING MAGNETS: HOW TO INCREASE THE EFFECTS OF THE π–d INTERACTION

COSMOS ◽  
2008 ◽  
Vol 04 (02) ◽  
pp. 131-140 ◽  
Author(s):  
AKIRA MIYAZAKI ◽  
TOSHIAKI ENOKI
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Transition Temperature ◽  
Phase Boundary ◽  
Ground State ◽  
Magnetic Order ◽  
Molecular Magnets ◽  
Metallic State ◽  
One Dimensional

The crystal structures and electronic and magnetic properties of conducting molecular magnets developed by our group are reviewed from the viewpoints of our two current strategies for increasing the efficiency of the π–d interaction. (EDTDM)2 FeBr 4 is composed of quasi-one-dimensional donor sheets sandwiched between magnetic anion sheets. The ground state of the donor layer changes from the insulator state to the metallic state by the application of pressure. When it is near to the insulator–metal phase boundary pressure, the magnetic order of the anion spins considerably affects the transport properties of the donor layer. The crystal structure of ( EDO – TTFBr 2)2 FeX 4 ( X = Cl , Br ) is characterized by strong intermolecular halogen–halogen contacts between the organic donor and FeX 4 anion molecules. The presence of the magnetic order of the Fe 3+ spins and relatively high magnetic order transition temperature proves the role of the halogen–halogen contacts as exchange interaction paths.

Synthesis and Characterization of the Heptanuclear [MnIII 6 CoIII]3+ Triplesalen Complex: Evidence for Exchange Pathways Involving Low-spin CoIII

2010 ◽  
Vol 65 (3) ◽  
pp. 295-303 ◽  
Author(s):  
Erich Krickemeyer ◽  
Veronika Hoeke ◽  
Anja Stammler ◽  
Jürgen Schnack ◽  
Hartmut Bögge ◽  
...  
Keyword(s):  
Exchange Interaction ◽  
Metal Ion ◽  
Magnetic Measurements ◽  
Variable Temperature ◽  
Molecular Structures ◽  
Magnetic Data ◽  
Zero Field ◽  
Central Metal ◽  
Zero Field Splitting ◽  
Isotropic Exchange

The reaction of the tert-butyl-substituted triplesalen ligand H6talent-Bu2 with MnII(OAc)2・ 4H2O and K3[CoIII(CN)6] results in the formation of the heptanuclear complex [{(talent-Bu2 )- (MnIII(MeOH))3}2{CoIII(CN)6}](PF6)2(OAc)・11MeOH ([MnIII6 CoIII](PF6)2(OAc)・11MeOH, 1 ・11MeOH), which has been characterized by FT-IR spectroscopy, elemental analysis, ESI-MS, single-crystal X-ray diffraction, and magnetic measurements. The molecular structure of the [MnIII6 CoIII]3+ complex is closely related to the already published analogs [MnIII6CrIII]3+ and [MnIII6 FeIII]3+. Variable-temperature variable-field and μeff vs. T magnetic data have been analyzed in detail by full-matrix diagonalization of the appropriate spin-Hamiltonian consisting of isotropic exchange, zero-field splitting, and Zeeman interaction, taking into account the relative orientation of the D tensors. This allowed a careful inspection of the MnIII-MnIII exchange interaction involving a diamagnetic central metal ion. A satisfactory reproduction of the magnetic data required the incorporation not only of an exchange interaction between the MnIII ions belonging to one triplesalen half unit, but also of an exchange coupling between MnIII ions belonging to different triplesalen subunits. Satisfactory reproduction of the experimental data has been obtained for the parameter set J1 = −(0.50±0.04) cm−1, J2 = +(0.05±0.02) cm−1, and D = −(2.5±0.5) cm−1. A detailed analysis of the J1 coupling taking into account the molecular structures of the three available heptanuclear complexes [MnIII6MIII]3+ (M = Cr, Fe, Co) indicates that the exchange interaction between the MnIII ions belonging to the same triplesalen subunit involves not only an exchange pathway through the central phloroglucinol unit but also an exchange pathway through the central metal ion.

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