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Search for "hexadentate" in Full Text gives 3 result(s) in Beilstein Journal of Organic Chemistry.
Architecture and synthesis of P,N-heterocyclic phosphine ligands
- Wisdom A. Munzeiwa,
- Bernard Omondi and
- Vincent O. Nyamori
Beilstein J. Org. Chem. 2020, 16, 362–383, doi:10.3762/bjoc.16.35
- chloropyridylphosphine 14 with PhPLi2. In a similar manner, the hexadentate pyridylphosphine 16 was synthesized: Firstly, PhPH2 was treated with an equivalent amount of n-BuLi to afford LiPHPh. The latter was then reacted with 14, followed by deprotonation with n-BuLi and reaction with 0.5 equiv CH2Br2 to afford
- hexadentate compound 16 in 73% yield. The synthesis of 19 (Scheme 3B) was achieved in moderate to high yield, firstly, by reacting equimolar amounts of LiPHPh and 2-chloropyridine (17) to give (2-pyridyl)phenylphosphide 18. Secondly, compound 18 was bridged by reaction with a half molar equivalent of
Graphical Abstract
Scheme 1: Synthesis of pyridylphosphine ligands.
Figure 1: Pyridylphosphine ligands.
Scheme 2: Synthesis of piperidyl- and oxazinylphosphine ligands.
Scheme 3: Synthesis of linear multi-chelate pyridylphosphine ligands.
Scheme 4: Synthesis of chiral acetal pyridylphosphine ligands.
Scheme 5: Synthesis of diphenylphosphine-substituted triazine ligands.
Scheme 6: Synthesis of (pyridine-2-ylmethyl)phosphine ligands.
Scheme 7: Synthesis of diphosphine pyrrole ligands.
Scheme 8: Synthesis of 4,5-diazafluorenylphosphine ligands.
Scheme 9: Synthesis of thioether-containing pyridyldiphosphine ligands starting from ethylene sulfide and dip...
Scheme 10: Synthesis of monoterpene-derived phosphine pyridine ligands.
Scheme 11: Synthesis of N-phenylphosphine-substituted imidazole ligands.
Scheme 12: Synthesis of triazol-4-ylphosphine ligands.
Scheme 13: Synthesis of phosphanyltriazolopyridines and product selectivity depending on the substituents’ eff...
Scheme 14: Synthesis of PTA-phosphine ligands.
Scheme 15: Synthesis of isomeric phosphine dipyrazole ligands by varying the reaction temperature.
Scheme 16: Synthesis of N-tethered phosphine imidazolium ligands (route A) and diphosphine imidazolium ligands...
Scheme 17: Synthesis of {1-[2-(pyridin-2-yl)- (R = CH) and {1-[2-(pyrazin-2-yl)quinazolin-4-yl]naphthalen-2-yl...
Scheme 18: Synthesis of oxazolylindolylphosphine ligands 102.
Scheme 19: Synthesis of pyrrolylphosphine ligands.
Scheme 20: Synthesis of phosphine guanidinium ligands.
Scheme 21: Synthesis of a polydentate aminophosphine ligand.
Scheme 22: Synthesis of quinolylphosphine ligands.
Scheme 23: Synthesis of N-(triazolylmethyl)phosphanamine ligands.
Figure 2: Triazolylphosphanamine ligands synthesized by Wassenaar’s method [22].
Scheme 24: Synthesis of oxazaphosphorines.
Scheme 25: Synthesis of paracyclophane pyridylphosphine ligands.
Scheme 26: Synthesis of triazolylphosphine ligands.
Figure 3: Click-phosphine ligands.
Scheme 27: Ferrocenyl pyridylphosphine imine ligands.
Scheme 28: Synthesis of phosphinooxazolines (PHOX).
Scheme 29: Synthesis of ferrocenylphosphine oxazoles.
Spin state switching in iron coordination compounds
- Philipp Gütlich,
- Ana B. Gaspar and
- Yann Garcia
Beilstein J. Org. Chem. 2013, 9, 342–391, doi:10.3762/bjoc.9.39
- -tetrazole)6]X2 complexes, which are nearly regular octahedral [50]. Another possibility to fulfill the condition for thermal spin crossover to occur is the coordination of a hexadentate system, such as the mixed aliphatic/heterocyclic tetrakis(2-pyridylmethyl)ethylenediamine) [51] or the completely
- saturated, encapsulating hexadentate donor system as described by Martin et al. [52]. Through extensive synthetic work one has learned that cooperative interactions between the spin-state-changing complex molecules are of utmost importance for the ST behavior in solid SCO compounds. There are essentially
Graphical Abstract
Figure 1: Change of electron distribution between HS and LS states of an octahedral iron(II) coordination com...
Figure 2: Types of spin transition curves in terms of the molar fraction of HS molecules, γHS(T), as a functi...
Figure 3: Single crystal UV–vis spectra of the spin crossover compound [Fe(ptz)6](BF4)2 (ptz = 1-propyltetraz...
Figure 4: Thermal spin crossover in [Fe(ptz)6](BF4)2 (ptz = 1-propyltetrazole) recorded at three different te...
Figure 5: (a) Mössbauer spectra of the LS compound [Fe(phen)3]X2 recorded over the temperature range 300–5 K....
Figure 6: (left) Demonstration of light-induced spin state trapping (LIESST) in [Fe(ptz)6]BF4)2 with 57Fe Mös...
Figure 7: Schematic representation of the pressure influence (p2 > p1) on the LS and HS potential wells of an...
Figure 8: χMT versus T curves at different pressures for [Fe(phen)2(NCS)2], polymorph II. (Reproduced with pe...
Figure 9: Molecular structure (a) and γHS(T) curves at different pressures for [CrI2(depe)2] (b) (Reproduced ...
Figure 10: HS molar fraction γHS versusT at different pressures for [Fe(phy)2](BF4)2. The hysteresis loop broa...
Figure 11: Proposed structure of the polymeric [Fe(4R-1,2,4-triazole)3]2+ spin crossover cation (a) and plot o...
Figure 12: Temperature dependence of the HS fraction γHS(T), determined from Mössbauer spectra of [Fe(II)xZn1-x...
Figure 13: Influence of the noncoordinated anion on the spin transition curve γHS(T) near the transition tempe...
Figure 14: Spin transition curves γHS(T) for different solvates of the SCO complexes. [Fe(II)(2-pic)3]Cl2·Solv...
Figure 15: ST curves γHS(T) of the deuterated solvates of [Fe(II)(2-pic)3]Cl2·Solv with Solv = C2D5OH and C2H5...
Figure 16: Sketch of the two-step spin transition; [LS–LS] pair is diamagnetic, [LS–HS] is paramagnetic and th...
Figure 17: (left) Temperature dependence of χMT for {[Fe(L)(NCX)2]2bpym}(L = bpym or bt and X = S or Se). (rig...
Figure 18: Temperature dependence of χMT for [bpym, NCS−] (left) and [bpym, NCSe−] (right) at different pressu...
Figure 19: 57Fe Mössbauer spectra of [bpym, NCSe−] measured at 4.2 K at zero field (a) and at 5 T (b) (see tex...
Figure 20: Temperature dependence of χMT for [Fe2(L)3](ClO4)4·2H2O showing a complete two-step spin conversion...
Figure 21: (a) View of the dinuclear unit in the crystal structure of [Fe2(Hsaltrz)5(NCS)4]·4MeOH. (b) Tempera...
Figure 22: (left) AFM pattern recorded in tapping mode at room temperature on hexagonal single crystals of [Fe3...
Figure 23: (right) Stepwise SCO in an Fe4 [2 × 2] grid, which reveals a smooth magnetic profile under ambient ...
Figure 24: (left) View of the discrete nanoball made of Fe(II) SCO units as well as Cu(I) building blocks. (ri...
Figure 25:
(left) Linear dependency between T1/2 in the heating (Δ) and cooling (![[Graphic 1]](/bjoc/content/inline/1860-5397-9-39-i3.png?max-width=637&scale=1.18182)
) modes versus the anion volu...
Figure 26: (left) View of the linear chain structure of [Fe(1,2-bis(tetrazol-1-yl)propane)3]2+ along the a axi...
Figure 27: (left) View of the 2D layered structure of [Fe(btr)2(NCS)2]·H2O (at 293 K). The water molecules (in...
Figure 28: (left) Three interpenetrated square networks for [Fe(bpb)2(NCS)2]·MeOH. (right) χMT versus T plot s...
Figure 29: Part of the crystal structure of [Fe{N(entz)3}](BF4)2 (T = 293 K) [335,336]. (Reproduced with permission fro...
Figure 30: (left) Projection of the crystal structure of [Fe(btr)3](ClO4)2 along the c axis revealing a 3D str...
Figure 31: Size-dependent SCO properties in [Fe(pz)Pt(CN)4] (left), change of color upon spin state transition...
Figure 32: Schematic showing the epitaxial growth of polymer {Fe(pz)[Pt(CN)4]} and the spin transition propert...
Figure 33: Microcontact printing (μCP) of nanodots on Si-wafer of [Fe(ptz)6](BF4)2 after deposition of crystal...
Figure 34: (left) Projection of the two independent cations of [Fe(C6–trenH)]2+ with atom numbering scheme (15...
Figure 35: (a) χMT versus T for [Fe(C16-trenH)]Cl2·0.5H2O and variation of the distance d with temperature (T)...
Figure 36: Schematic illustration of the structure of compounds [Fe(Cn-tba)3]X2 adopting a columnar mesophase ...
Figure 37: Temperature dependence of the magnetic moment (M) at 1000 Oe and DSC profiles (inset; 5 °C/min) of ...
Figure 38: Porous structure of the SCO-PMOFs {Fe(pz)[M(II)(CN)4]} (left), representation of the host–guest int...
Figure 39: Porous structure of the guest-free SCO-PMOF’s {Fe(pz)[M(II)(CN)4]} (left), magnetic properties of t...
Figure 40: (left) The 3D porous structure of {Fe(pz)[Pt(CN)4]}·0.5(CS(NH2)2) (1) and {Fe(pz)[Pd(CN)4]}·1.5H2O·...
Figure 41: Top: The 3D porous structure of {Fe(dpe)[Pt(CN)4]}·phenazine in a direction close to [101] emphasiz...
Figure 42: View of the segregated stacking of [Ni(dmit)2]− and [Fe(sal2-trien)]+ in [Fe(qsal)2][Ni(dmit)2]3·CH3...
Figure 43: Thin films based on Fe(III) compounds coordinated to Terthienyl-substituted QsalH ligands [434] together...
Figure 44: Left: Temperature-dependent emission spectra for [Fe2(Hsaltrz)5(NCS)4]·4MeOH at λex = 350 nm over t...
Design and synthesis of a cyclitol-derived scaffold with axial pyridyl appendages and its encapsulation of the silver(I) cation
- Pierre-Marc Léo,
- Christophe Morin and
- Christian Philouze
Beilstein J. Org. Chem. 2010, 6, 1022–1024, doi:10.3762/bjoc.6.115
- scaffold with C3v symmetry bearing three axial pyridyl appendages is presented. This pre-organized hexadentate ligand allows complexation of silver(I). The crystal structure of the complex was established. Keywords: cyclitol; glyco-scaffolds; hexadentate; scyllo-inositol; silver(I) complexation
Graphical Abstract
Figure 1: spatial representation of structure 1.
Figure 2: structures of compounds 2–9.
Figure 3: ORTEP drawing for the 1·Ag(I) cation complex (ellipsoids are drawn at the 50% probability level and...
