Diphosphine Substitution and Carbyne Ligand Transfer in the Reaction of 2,3-Bis(diphenylphosphino)maleic Anhydride (bma) with the Methylidyne-capped Clusters HCCo2MCp(CO)8 (where M=Mo, W): Synthesis and X-ray Diffraction Structures of the Vinylidene-bridged Clusters Co2MCp(CO)6[μ–C=C(H)CH2C(PPh2)C(PPh2)C(O)OC(O)]

2008 ◽  
Vol 38 (6) ◽  
pp. 437-445 ◽  
Author(s):  
Weiqiang Zhang ◽  
William H. Watson ◽  
Michael G. Richmond
Keyword(s):  
Maleic Anhydride ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ligand Transfer

Photochemically Induced C-H Bond Activation and Ligand Transfer in the Reaction of [Cp2Rh2(CO)(CF3C2CF3)] With [(Cp′) Mn (CO)2( thf )]: Structural Characterization of the Rh4 Product

1994 ◽  
Vol 47 (8) ◽  
pp. 1613 ◽  
Author(s):  
RS Dickson ◽  
MJ Liddell ◽  
BW Skelton ◽  
AH White
Keyword(s):  
Room Temperature ◽  
Bond Activation ◽  
X Ray Diffraction ◽  
Full Matrix ◽  
X Ray ◽  
Corrected Data ◽  
Ligand Transfer ◽  
Hydrocarbon Solution ◽  
Induced Reaction

A room-temperature single-crystal X-ray diffraction study carried out on a product of a sunlight induced reaction between [Cp2Rh2(CO)(CF3C2CF3)] and [(Cp′) Mn (CO)2( thf )] in 2:1 ratio in hydrocarbon solution establishes it to be tetranuclear [(Cp4Rh4)(CF3C=CHCF3)2(CH3-C5H3)]; crystals of the latter are triclinic, Pī , a 15.803(9), b 13.445(8), c 8.966(6) Ǻ, α 75.92(5), β 80.68(5), γ 65.46(4)°, Z = 2. Full-matrix refinement for 3431 'observed' [I > 3σ(I)], absorption-corrected data converged at R 0.056. The structure comprises a pair of enantiomeric [(Cp2Rh2)(CF3C=CHCF3 binuclear units unsymmetrically linked by the central CH3C5H3 ring, by way of the η1,η2-C=CH and η1,η2-C= CMe functionalities.

Effect of unsaturation on physicochemical properties of maleic anhydride–grafted acrylonitrile butadiene styrene terpolymer

2017 ◽  
Vol 50 (6) ◽  
pp. 520-536 ◽  
Author(s):  
Olongal Manaf ◽  
Sheeja ◽  
Ameen Jowhar ◽  
Athiyanathil Sujith
Keyword(s):  
Maleic Anhydride ◽  
Iodine Value ◽  
Flexural Modulus ◽  
Slight Modification ◽  
Acrylonitrile Butadiene Styrene ◽  
Attenuated Total Reflectance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Internal Mixer ◽  
Butadiene Styrene

In order to find out the shift of ductile nature of acrylonitrile-butadiene-styrene (ABS) polymer to brittle nature while maleic anhydride (MA) grafting, the iodine value of different MA-grafted ABS (MA-g-ABS) sampled has been determined. The iodine value of thermoplastic polymer is found by Wijs method with slight modification to overcome the poor solubility of thermoplastics in tetrachloromethane. Different samples with varying MA content were prepared using internal mixer. All the specimens were characterized by attenuated total reflectance IR spectroscopy and X-ray diffraction analysis. The iodine value measurements revealed that grafting and cross-linking evidently reduced the unsaturation in ABS polymer matrix. The grafting of MA causes the decrease in impact strength, flexural modulus, and a significant increase in crystallinity, tensile strength, yield point, and flexural strength, whereas thermal stability remains intact. Field emission scanning electron microscope images showed noticeable difference in broken surface texture between ABS and grafted samples.

scholarly journals Synthesis, solid-state structures and reduction reactions of heteroleptic Ge(II) and Sn(II) β-ketoiminate complexes

2017 ◽  
Vol 72 (11) ◽  
pp. 813-820 ◽  
Author(s):  
Jessica Wiederkehr ◽  
Christoph Wölper ◽  
Stephan Schulz
Keyword(s):  
General Type ◽  
Heteronuclear Nmr ◽  
X Ray Diffraction ◽  
Group 14 ◽  
Subsequent Formation ◽  
X Ray ◽  
Tin Complexes ◽  
Ligand Transfer ◽  
Solid State Structures ◽  
Heteroleptic Complex

AbstractA series of new heteroleptic divalent germaniun and tin complexes of the general type L1,4GeN(SiMe3)2 (1, 2) and L1−4SnN(SiMe3)2 (3–6) were synthesized by reaction of β-ketimines L1−4H with Ge[N(SiMe3)2]2 and Sn[N(SiMe3)2]2, respectively. The reaction of 3 with the strong Mg(I) reductant L5Mg yielded the heteroleptic complex L1MgL57 after ligand transfer from tin to magnesium, whereas analogous reactions of L4GeN(SiMe3)22 and L4SnN(SiMe3)26 with L5Mg occurred with formation of insoluble precipitates, transfer of the amido substituent from the group 14 metal to magnesium and subsequent formation of the heteroleptic magnesium complex L5MgN(SiMe3)2 (8). 1–8 were characterized by heteronuclear NMR (1H, 13C, 119Sn) and IR spectroscopy, elemental analysis and single-crystal X-ray diffraction (L4SnN(SiMe3)26, L1MgL57).

scholarly journals The structure and characteristics of photochromic dithienylethenes

2001 ◽  
Vol 3 (1) ◽  
pp. 25-32 ◽  
Author(s):  
M. M. Krayushkin ◽  
L. G. Vorontsova ◽  
B. M. Uzhinov
Keyword(s):  
Double Bond ◽  
Maleic Anhydride ◽  
Diffraction Analysis ◽  
Functional Groups ◽  
X Ray Diffraction ◽  
Photochromic Properties ◽  
X Ray ◽  
Aromatic Heterocycles ◽  
Envelope Conformation ◽  
Characteristic Features

The data on X-ray diffraction analysis for dihetarylethenes with perfluorocyclopentene (F), maleic anhydride (M) and cyclobutenedione (S) bridges between thienyl fragments were summarized and their photochromic properties were discussed. It was established that benzoxazole and benzothiazole substituents in position 5 of thienyl rings are coplanar to the plane of thiophene cycles. Thienyl fragments in A form of all dithienylethenes are considerably turned relative to the plane of bridging cycle. It means that there is no conjugation betweenπ-electrons of aromatic heterocycles and double bond of the bridge.Flattening of molecule frameworkand the envelope conformation of thienyl cycles because of aromaticity loss are characteristic features of the form B structure with F-bridge. In all cases (excluding the compounds with alkylthio substituents in position 2 of thiophene cycle) the photochromic transitionA→Bis observed independently of different nature and structure of functional groups.

scholarly journals Adsorptive Removal of Cd(II) Ions from Wastewater Using Maleic Anhydride Nanocellulose

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Hizkeal Tsade Kara ◽  
Sisay Tadesse Anshebo ◽  
Fedlu Kedir Sabir
Keyword(s):  
Maleic Anhydride ◽  
Eichhornia Crassipes ◽  
X Ray Diffraction ◽  
Uptake Mechanism ◽  
X Ray ◽  
Hydrolysis Method ◽  
Adsorbent Regeneration ◽  
Pseudo Second Order ◽  
Uptake Process ◽  
Regeneration Study

In this study, both pristine cellulose nanocrystalline (CNC) and maleic anhydride functionalized cellulose nanocrystalline (MA-CNC) were prepared from the stems of Eichhornia crassipes weed by the sulfuric acid hydrolysis method. The as-prepared adsorbents were characterized by using X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), and Brunauer–Emmett–Teller (BET) instruments. These materials were applied for the removal of Cd(II) ions from WW. The uptake mechanism was fixed to both Langmuir and Freundlich adsorption isotherms with a maximum Cd(II) ion uptake capability (qmax) of 75.76 and 215.52 mg g−1 by CNC and MA-CNC adsorbents, respectively. Pseudo-second-order (PSO) kinetic model was well fitted to the uptake process. The adsorbent regeneration study was done after desorption of Cd(II) ions from the adsorbent by HCl washing. Results exhibited that the adsorbent was reused for the removal of Cd(II) ions from real WW after successive 13th cycle.

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