scholarly journals Nickel(II) and palladium(II) chelates of dehydroacetic acid Schiff bases derived from thiosemicarbazide and hydrazinecarbodithioate

1994 ◽  
Vol 72 (8) ◽  
pp. 1785-1788 ◽  
Author(s):  
Abdulla Al Kubaisi ◽  
Kamal Z. Ismail
Keyword(s):  
Molecular Weight ◽  
Schiff Bases ◽  
Acid Amide ◽  
Organic Ligands ◽  
Resonance Spectroscopy ◽  
Molecular Weight Determination ◽  
Lewis Bases ◽  
Dehydroacetic Acid ◽  
Square Planar ◽  
Elemental Analyses

Dehydroacetic acid Schiff bases DAE (1) and DATS (2) were isolated from the reaction of dehydroacetic acid (2-acetyl-5-hydroxy-3-oxo-4-hexenoic acid-δ-lactone) with hydrazine-S-methylcarbodithioate and the corresponding acid amide, thiosemicarbazide, respectively. Reaction of such Schiff bases with nickel(II) and palladium(II) ions afforded the dimeric monoligand chelates [M(DAE-2H)]2 and [M(DATS-2H)]2; M = Ni(II) or Pd(II). In the presence of monodentate Lewis bases, B, square-planar chelates [M(DAE-2H)B] and [M(DATS-2H)B], in which B = pyridine or triphenylphosphine, were isolated. The stoichiometry and structure of the isolated organic ligands and their chelates were confirmed through elemental analyses, molecular weight determination, and infrared, ultraviolet–visible, and 1H and 13C nuclear magnetic resonance spectroscopy.

scholarly journals Immobilised nickel(II), dioxomolybdenum(VI) and dioxouranium(VI) complexes on polystyrene resin

2021 ◽  
Vol 23 (06) ◽  
pp. 11201-1127
Author(s):  
Amit Kumar ◽  
◽  
Praveen Kumar Gupta ◽  
Sunil Kumar ◽  
Dinesh Kumar ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Schiff Bases ◽  
Coordination Compounds ◽  
Metal Salt ◽  
Donor Behavior ◽  
Square Planar ◽  
Elemental Analyses ◽  
Ir Reflectance ◽  
Polystyrene Resin ◽  
Supported Ni

New polystyrene supported mixed Schiff bases(PSCH 2 –LH 2 ) and their coordination compounds with nickel(II), dioxomolybdenum(VI), and dioxouranium(VI) have been synthesized. PSCH 2 –LH 2 have been synthesized by the reaction of chloromethylated polystyrene crosslinked with divinylbenzene(PSCH 2 –Cl) and the Schiff bases(LH 2 ) derived from 3-formylsalicylic acid, ethylenediamine or propylene diamine, and acetylacetone. The polystyrene-supported coordination compounds are of the types: PSCH 2 –LM(where M = Ni, MoO 2, UO 2 ). They have been synthesized by the reaction of PSCH 2 –LH 2 and the metal salt/metal coordination compounds in DMF. The coordination compounds have been characterized on the basis of elemental analyses, IR, reflectance, and magnetic susceptibility measurements. The shifts of the ν (C=N)(azomethine), ν (C–O)(phenolic) and ν (C–O)(enolic) stretches indicate the ONNO donor behavior of PSCH 2 –LH 2. The polystyrene-supported Ni(II) compound is square planar; MoO2 (VI) and UO2 (VI) compounds are octahedral and Zr(IV) compounds are pentagonal bipyramidal. The compounds, PSCH 2 –LM(where M = Ni, MoO 2, and UO 2 ) are diamagnetic.

Five Co-ordinate Complexes of Platinum(II) and Palladium(II)

1973 ◽  
Vol 51 (4) ◽  
pp. 618-623 ◽  
Author(s):  
K. R. Dixon ◽  
A. D. Rattray
Keyword(s):  
Molecular Weight ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Equatorial Plane ◽  
Spectroscopic Data ◽  
Resonance Spectroscopy ◽  
Trigonal Bipyramidal ◽  
Elemental Analyses ◽  
Bipyramidal Structure

Reactions of 1,10-phenanthroline with halogen bridged dinuclear species, [M2X2(PPh2O)2(PPh2OH)2] and [M2X2(PR3)4][BF4]2, give the new five co-ordinate complexes, [MX(PPh2O)(PPh2OH)(Phen)] and [MX(PR3)2(Phen)][BF4], where M = Pd or Pt, X = Cl or Br, Ph = phenyl, and R = ethyl (or phenyl when M = Pd). Decomposition of the [MX(PR3)2(Phen)][BF4] complexes in hot solvents gives the four co-ordinate species, [MX(PR3)(Phen)][BF4]. The complexes are characterized by elemental analyses, molecular weight, and conductance measurements and infrared and nuclear magnetic resonance spectroscopy. The spectroscopic data show that [PtCl(PEt3)2(Phen)][BF4] has a trigonal bipyramidal structure with the phenanthroline and one triethylphosphine in the equatorial plane and a chlorine and a triethylphosphine in the axial positions.

scholarly journals Synthesis, Characterization and Antimicrobial Screening of Some Organotin Complexes Derived from Salicyl Hydrazide Schiff Bases

2021 ◽  
Vol 33 (12) ◽  
pp. 2977-2981
Author(s):  
Priyanka ◽  
Hardeep Singh Tuli ◽  
Pallvi Aggarwal ◽  
Manoj Kumar
Keyword(s):  
Mass Spectrometry ◽  
Schiff Bases ◽  
1H Nmr ◽  
13C Nmr ◽  
Methyl Salicylate ◽  
Therapeutic Potential ◽  
Dehydroacetic Acid ◽  
Elemental Analyses ◽  
119Sn Nmr ◽  
Ft Ir

A series of new organotin(IV) compounds [Me2SnL], [Et2SnL], [Bu2SnL] and [Ph2SnL], where L = 2-hydroxy-N-(1-(4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)ethylidene)benzohydrazide has been synthesized by refluxing methyl salicylate hydrazide hydrate with dehydroacetic acid (DHA) with the corresponding organotin(IV) chlorides. All the compounds were characterized by elemental analyses, FT-IR, 1H NMR, 13C NMR, 119Sn NMR and mass spectrometry. The synthesized complexes found to have wide therapeutic potential.

scholarly journals Synthesis, Characterization, and Non-Covalent Interactions of Palladium(II)-Amino Acid Complexes

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4331
Author(s):  
David B. Hobart ◽  
Michael A. G. Berg ◽  
Hannah M. Rogers ◽  
Joseph S. Merola
Keyword(s):  
Amino Acid ◽  
High Resolution Mass Spectrometry ◽  
Resonance Spectroscopy ◽  
Spectroscopic Techniques ◽  
X Ray Diffraction ◽  
Amino Acid Complexes ◽  
Acetone Water ◽  
Square Planar ◽  
Non Covalent Interactions ◽  
Covalent Interactions

The reaction of palladium(II) acetate with acyclic amino acids in acetone/water yields square planar bis-chelated palladium amino acid complexes that exhibit interesting non-covalent interactions. In all cases, complexes were examined by multiple spectroscopic techniques, especially HRMS (high resolution mass spectrometry), IR (infrared spectroscopy), and 1H NMR (nuclear magnetic resonance) spectroscopy. In some cases, suitable crystals for single crystal X-ray diffraction were able to be grown and the molecular structure was obtained. The molecular geometries of the products are discussed. Except for the alanine complex, all complexes incorporate water molecules into the extended lattice and exhibit N-H···O and/or O···(HOH)···O hydrogen bonding interactions. The non-covalent interactions are discussed in terms of the extended lattice structures exhibited by the structures.

scholarly journals Effect of DMPA and Molecular Weight of Polyethylene Glycol on Water-Soluble Polyurethane

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1915 ◽  
Author(s):  
Eyob Wondu ◽  
Hyun Woo Oh ◽  
Jooheon Kim
Keyword(s):  
Molecular Weight ◽  
Contact Angle ◽  
Polyethylene Glycol ◽  
Photoelectron Spectroscopy ◽  
Water Solubility ◽  
Soft Segment ◽  
Water Soluble ◽  
Size Exclusion ◽  
Resonance Spectroscopy ◽  
Scanning Calorimetry

In this study water-soluble polyurethane (WSPU) was synthesized from isophorone diisocyanate (IPDI), and polyethylene glycol (PEG), 2-bis(hydroxymethyl) propionic acid or dimethylolpropionic acid (DMPA), butane-1,4-diol (BD), and triethylamine (TEA) using an acetone process. The water solubility was investigated by solubilizing the polymer in water and measuring the contact angle and the results indicated that water solubility and contact angle tendency were increased as the molecular weight of the soft segment decreased, the amount of emulsifier was increased, and soft segment to hard segment ratio was lower. The contact angle of samples without emulsifier was greater than 87°, while that of with emulsifier was less than 67°, indicating a shift from highly hydrophobic to hydrophilic. The WSPU was also analyzed using Fourier transform infrared spectroscopy (FT-IR) to identify the absorption of functional groups and further checked by X-ray photoelectron spectroscopy (XPS). The molecular weight of WSPU was measured using size-exclusion chromatography (SEC). The structure of the WSPU was confirmed by nuclear magnetic resonance spectroscopy (NMR). The thermal properties of WSPU were analyzed using thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC).

Ring-Opening Polymerization of Lactide Using Aluminum Salen-Type Initiators

2014 ◽  
Vol 915-916 ◽  
pp. 713-716
Author(s):  
Qing Zhang ◽  
Jing Tian ◽  
Zhi Qi Cao ◽  
Ru Xia Xu ◽  
Zhen Zhen Sun ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Infrared Spectroscopy ◽  
Reaction Time ◽  
Magnetic Resonance ◽  
Schiff Bases ◽  
Reaction Temperature ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Resonance Spectroscopy ◽  
Aluminum Complex

In this investigation, Schiff bases aluminum complex was synthesized and used as the initiator in the polymerization of D,L-lactide. The aluminum complex was characterized by infrared spectroscopy (IR), and nuclear magnetic resonance spectroscopy (NMR). The influences of different factors, including reaction time, reaction temperature, and the ratio of D, L-lactide/Al3+ on the synthesis of polylactide were described. The results showed that Schiff bases aluminum complex could be successfully applied in the ring opening polymerization. The optimum condition of the ring opening polymerization of D,L-lactide, which included D,L-lactide/Al3+ (mol/mol) ratio of 250, reaction temperature of 120 °C, and reaction time of 16 hours.

Molecular Weight Determination of Component Polypeptides of Glutenin after Fractionation by Gel Filtration

1975 ◽  
Vol 39 (8) ◽  
pp. 1527-1531
Author(s):  
Zen-ichiro Hamauzu ◽  
Yukio Kamazuka ◽  
Hirokazu Kanazawa ◽  
Daizo Yonezawa
Keyword(s):  
Molecular Weight ◽  
Gel Filtration ◽  
Molecular Weight Determination
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