Switchable on–off spin-crossover properties of iron(ii) compounds by trimming intermolecular hydrogen bonds

2020 ◽  
Vol 49 (4) ◽  
pp. 998-1001 ◽  
Author(s):  
Na Li ◽  
Jin-Peng Xue ◽  
Jing-Lin Liu ◽  
Yao-Yao Wang ◽  
Zi-Shuo Yao ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Single Crystal ◽  
Spin Crossover ◽  
Intermolecular Hydrogen Bonds

Spin crossover on–off switching is realized by reversible single crystal-to-single crystal transformations, 1·3MeOH ⇌1 ⇌1·2HO.

scholarly journals ISOLATION AND STRUCTURAL ELUCIDATION OF A NEW DEPSIDE OF LICHEN Everniopsis trulla

2021 ◽  
Vol 87 (2) ◽  
pp. 97-106
Author(s):  
Olivio Nino Castro ◽  
Jesús López Rodilla ◽  
Sofia Pombal ◽  
Francisca Sanz González ◽  
Julio Santiago Contreras
Keyword(s):  
Mass Spectrometry ◽  
Melting Point ◽  
Hydrogen Bonds ◽  
Single Crystal ◽  
Spectroscopic Data ◽  
Intermolecular Forces ◽  
X Ray Diffraction ◽  
Intermolecular Hydrogen Bonds ◽  
X Ray ◽  
Uv Visible

In this research, a new depside of the lichen Everniopsis trulla has been isolated. The extraction was carried out to 400 g of dry sample and ground with ethanol for 3 repetitions, then, it was fractionated by applying column chromatography with the CHCl3-MeOH system and purified by recrystallization with MeOH-Acetone (1: 1); Finally, white crystals in the form of needles (solid C) with a melting point of 198 ° C were obtained, whose structure was elucidated based on spectroscopic data (UV-Visible, IR, NMR-H1, NMR-C13, mass spectrometry and single crystal X-ray diffraction). According to the Science Finder databases, it is a new depside, called trullarin, and it is observed that molecular packing is influenced by both intramolecular and intermolecular forces. Intermolecular hydrogen bonds of O - H -O type binds neighboring molecules forming dimers.

scholarly journals Assembly of Imidazolyl-Substituted Nitronyl Nitroxides into Ferromagnetically Coupled Chains

Crystals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 219 ◽  
Author(s):  
Vasily Romanov ◽  
Irina Bagryanskaya ◽  
Nina Gritsan ◽  
Dmitry Gorbunov ◽  
Yulia Vlasenko ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Single Crystal ◽  
Spin Density ◽  
Crystalline Form ◽  
Intermolecular Hydrogen Bonds ◽  
X Ray ◽  
Nitronyl Nitroxides

New nitronyl nitroxides, namely, 2-(4,5-dimethylimidazol-2-yl)- and 2-(4,5-dichloroimidazol-2-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-3-oxide-1-oxyl, were prepared in crystalline form. According to single-crystal X-ray data, intra- and intermolecular hydrogen bonds are formed between NH groups of the imidazole cycles and O atoms of the nitroxide moieties. The intermolecular H-bonds contribute to the alignment of molecules into chains along the a-axis; this alignment causes short intrachain contacts between O and C atoms carrying spin density of opposite signs. Such an arrangement of nitroxides induces ferromagnetic intrachain interactions (J ≈ 10 cm−1) between neighboring radicals.

Study on Novel Structure of Nitric Acid Phenanthroline Vanadium Monohydrate: [ V(C12H8N2) ·O2·(H2O)]·NO3·H2O

2012 ◽  
Vol 554-556 ◽  
pp. 852-855
Author(s):  
Hai Xing Liu ◽  
Jing Zhong Xiao ◽  
Lan Xu ◽  
Vitor Hugo Nunes Rodrigues ◽  
Manuela Ramos Marques da Silva ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Nitric Acid ◽  
Hydrogen Bonds ◽  
Single Crystal ◽  
Vanadium Complex ◽  
X Ray Diffraction ◽  
Intermolecular Hydrogen Bonds ◽  
X Ray ◽  
Simple Reaction ◽  
Novel Structure

A new vanadium complex [ V(C12H8N2) ·O2·(H2O)]·NO3·H2O h as been synthesized from a simple reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. Monoclinic, P2(1)/c. a = 9.5137(2) Å b = 19.3181(4) Å c = 7.51800(10) Å α=γ=90 β= 93.6830. V= 1378.85(4) Å3. Z=2. Rgt(F) = 0.0255, wRref(F2) = 0.0809. T= 273(2) K. The compound consisted of a [ V(C12H8N2) ·O2·(H2O)]+ cation, one NO3-anion and one water molecular. Molecule structure is stabilized by OHN , OHO intramolecular and intermolecular hydrogen bonds.

scholarly journals Carbamoyl Derivatives of a Pyridine-Based Tetraamine

2007 ◽  
Vol 62 (4) ◽  
pp. 519-522 ◽  
Author(s):  
Anvarhusen K. Bilakhiya ◽  
Frank W. Heinemann ◽  
Andreas Grohmann
Keyword(s):  
Hydrogen Bonds ◽  
Single Crystal ◽  
Structure Determination ◽  
Spectroscopic Data ◽  
Intermolecular Hydrogen Bonds ◽  
X Ray ◽  
Phenyl Derivative ◽  
High Yields ◽  
Derivatives Of

The reaction of four equivalents of phenyl or tert-butyl isocyanate with the pyridine-derived tetraamine 2,6-C3H3N[CMe(CH2NH2)2]2 in toluene gives high yields of the quadruply ureido substituted products 2,6-C5H3N[CMe(CH2R)2]2 [R = -NH(CO)NHPh and -NH(CO)NHtBu]. Full spectroscopic data for both compounds are given. A single crystal X-ray structure determination of the phenyl derivative reveals an intricate network of both intra- and intermolecular hydrogen bonds involving the C=O and both NH functionalities in all ureido groups.

Water induced spin-crossover behaviour and magneto-structural correlation in octacyanotungstate(iv)-based iron(ii) complexes

2016 ◽  
Vol 45 (46) ◽  
pp. 18643-18652 ◽  
Author(s):  
Rong-Min Wei ◽  
Ming Kong ◽  
Fan Cao ◽  
Jing Li ◽  
Tian-Cheng Pu ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Spin Crossover ◽  
Water Molecules ◽  
Intermolecular Hydrogen Bonds ◽  
Lattice Water ◽  
Structural Correlation ◽  
Exact Correlation ◽  
Octahedral Distortion

The SCO is mainly tuned by the octahedral distortion of the [FeN6] core caused by intermolecular hydrogen bonds, and there is an exact correlation between SCO behavior and the amount of lattice water molecules existing in the crystal.

A thermal- and light-induced switchable one-dimensional rare loop-like spin crossover coordination polymer

2019 ◽  
Vol 48 (45) ◽  
pp. 17014-17021 ◽  
Author(s):  
Wenlong Lan ◽  
Francisco Javier Valverde-Muñoz ◽  
Yong Dou ◽  
Xiaoyun Hao ◽  
M. Carmen Muñoz ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Hydrogen Bonds ◽  
Spin Crossover ◽  
Intermolecular Hydrogen Bonds ◽  
One Dimensional ◽  
1D Coordination Polymer ◽  
Crossover Behavior ◽  
Solvent Molecules

The looped-like 1D coordination polymer {Fe(DPIP)2(NCSe)2}n·4DMF displays a thermal and light spin crossover behavior strongly dependent on the occurrence of intermolecular hydrogen bonds between the ligand amide functions and the solvent molecules.

Study on Novel Structure of Yttrium Complex: C4H12K2O22S2Y2

2012 ◽  
Vol 557-559 ◽  
pp. 394-397
Author(s):  
Hai Xing Liu ◽  
Ting Yan Zhuang ◽  
Qing Zhi Pan ◽  
Hui Juan Yue ◽  
Guang Zeng ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Single Crystal ◽  
X Ray Diffraction ◽  
Intermolecular Hydrogen Bonds ◽  
X Ray ◽  
Novel Structure ◽  
Single Solution ◽  
Solution Reaction

A novel Yttrium complex C4H12K2O22S2Y2 has been synthesized from a single solution reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. The Y1 atom is coordinated by eight O atoms. The crystal is stable by the help of O-H…O intra- and intermolecular hydrogen bonds interaction.

A Crystallographic Study of Bis[S-benzyl-5-bromo-2-oxoindolin-3-ylidenemethanehydrazonthioate] Disulfide Solvated with Dimethylsulfoxide

2012 ◽  
Vol 9 (2) ◽  
pp. 87
Author(s):  
Mohd Abdul Fatah Abdul Manan ◽  
M. Ibrahim M. Tahir ◽  
Karen A. Crouse ◽  
Fiona N.-F. How ◽  
David J. Watkin
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Solvent Molecule ◽  
Site Occupancy ◽  
Unit Cell Parameters ◽  
Intermolecular Hydrogen Bonds ◽  
Triclinic Space Group ◽  
Cell Parameters ◽  
Crystallographic Study ◽  
Thiol Form

The crystal structure of the title compound has been determined. The compound crystallized in the triclinic space group P -1, Z = 2, V = 1839 .42( 18) A3 and unit cell parameters a= 11. 0460( 6) A, b = 13 .3180(7) A, c=13. 7321 (8) A, a = 80.659(3 )0, b = 69 .800(3 )0 and g = 77 .007 (2)0 with one disordered dimethylsulfoxide solvent molecule with the sulfur and oxygen atoms are distributed over two sites; S101/S102 [site occupancy factors: 0.6035/0.3965] and 0130/0131 [site occupancy factor 0.3965/0.6035]. The C22-S2 l and C 19-S20 bond distances of 1. 779(7) A and 1. 788(8) A indicate that both of the molecules are connected by the disulfide bond [S20-S21 2.055(2) A] in its thiol form. The crystal structure reveals that both of the 5-bromoisatin moieties are trans with respect to the [S21-S20 and CI 9-Nl 8] and [S20-S21 and C22-N23] bonds whereas the benzyl group from the dithiocarbazate are in the cis configuration with respect to [S21-S20 and C19-S44] and [S20-S21 and C22-S36] bonds. The crystal structure is further stabilized by intermolecular hydrogen bonds of N9-H35···O16 formed between the two molecules and N28-H281 ···O130, N28-H281 ···O131 and C4 l-H4 l l ···O 131 with the solvent molecule.

Single crystal to single crystal transformation of spin-crossover coordination polymers from 3D frameworks to 2D layers

2021 ◽  
Vol 9 (15) ◽  
pp. 5082-5087
Author(s):  
Yu Gong ◽  
Wang-Kang Han ◽  
Hui-Shu Lu ◽  
Qing-Tao Hu ◽  
Huan Tu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Single Crystal ◽  
Coordination Polymers ◽  
Ligand Exchange ◽  
Spin Crossover ◽  
Metal Organic Frameworks ◽  
Crystal Transformation ◽  
Metal Organic

New Hofmann-type metal–organic frameworks display rare and complete ligand exchange induced single crystal to single crystal transformations from 3D frameworks to 2D layers, accompanied by magnetic properties transition from two-step SCO behavior to hysteretic SCO behavior.

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