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After warming to room temperature, the solution was concentrated to 3. After a few days, colorless crystals of 4 were deposited 0. Structure of the Tetraphosphetane 4 methine, 2H , 3. X-ray Crystallography.
Synthesis and Reactivity. Synthesis of the Terminal Phosphanylphosphido Complex 2 Scheme 3. Reactions of 1 with the lithium salt of diphosphanecontaining diisopropylamino substituents led to the formation of polyphosphorus compounds.
The mixing of DME solutions of 1 with ca. Presumably the starting iron II complex is reduced to an iron I species by the lithium salt of diphosphane with the simultaneous formation of polyphosphorous compounds Scheme 4.
This compound is thermally stable and can be stored under argon at room temperature for a long time. Complex 3 is stable at room temperature but easily reacts with moisture and oxygen. It is worth emphasizing that, in solvents such as THF and DME, complex 1 does not react with lithium derivatives of diphosphanes to yield phosphanylphosphinidene R2PP supported iron complexes.
In contrast, we observed the formation of such compounds in reactions with platinum, zirconium, molybdenum, and tungsten dichloride complexes when the SiMe3 group of the phosphanylphosphido complex D DOI: In this case, the main reaction product was 1,3-bis trimethylsilyl 2,4-bis diisopropylamino tetraphosphetane. Crystal Structure of 2. The representation of its X-ray structure is shown in Figure 1.
In Figure 2. Molecular structure of 3 showing the atom numbering scheme. Hydrogen atoms have been omitted for clarity. Our recent investigation of the phosphanylphosphido complexes supported by transition-metal ions suggests that coligands such as the cyclopentadienyl anion in the case of early transition metals stabilize terminal coordination of the R2PPSiMe3 ligand to the metal center,22,23 whereas nitrogen ligands like imido or nacnac stabilize side-on coordination mode.
Crystal Structure of 4. Molecular structure of 2 showing the atom numbering scheme.
Crystal Structure of 3. The Fe1 atom displays a distorted tetrahedral geometry. Molecular structure of 4 showing the atom numbering scheme. E DOI: The nitrogen atoms of the i-Pr2N 2P group display exact planar geometry, with nitrogen atoms connected to ring phosphorus atoms being almost planar.
The stabilities of 2 and 3 in solution were investigated by variabletemperature 1H NMR spectroscopy.
Both complexes exhibit resonances in a very wide range, from Complex 2 is less stable in a toluene-d8 solution compared to compound 3. The solid red lines are simulations obtained using the spin Hamiltonian of eq 1 and the parameters listed in Table 1. Furthermore, this doublet accounts for essentially all of the iron present in the sample.
These observations were corroborated by the spectral simulations of the complete data set see the Supporting Information. In particular, analysis of the 4. This observation reveals that the A tensor is dominated by large orbital contributions, vide infra. The asymmetry of the quadrupole doublets originates, most likely, from the partial alignment of the polycrystalline material. Dialogues between characters are often meaningless and does not fit well with the flow of the story, makes you wonder whether it was a case of the author filling the pag How this book became best seller is beyond me.
Dialogues between characters are often meaningless and does not fit well with the flow of the story, makes you wonder whether it was a case of the author filling the pages.
But the worst part is the high number of typos in this book. Where was the editor?! It makes you think, if this book is best seller, what kind of youths with their stupid view of the ideal world make no mistake, this book is a reflection of the wants of the average Indonesian youth and their lack of literary appreciation will bring this country out of its backside?
There are some good themes about friendship, dreams, and attempts to glorify nationalism. But the bottom line is, if this is the literary marvel Indonesia has to offer today, then the our modern culture is in a sad, sad state. At first, the story flows fresh and natural but then its turned become over dramatic.
There are too many quotes and wasted conversations in the mid The basic ideas are about friendship, courage, and nationalism. There are too many quotes and wasted conversations in the middle of the story. The ending is disappointing.
For me, its more like a comedy book than a proper fiction. Thats it! Jul 31, Putri Primanda rated it it was amazing A powerful book..