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Ranjan, Rajeev
- Synthesis and Study of some Crown Ether Complexes of Ba(II) Ion by IR and 1H-NMR Analysis
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Authors
Affiliations
1 PG Department of Chemistry, Ranchi College, Ranchi-834008
1 PG Department of Chemistry, Ranchi College, Ranchi-834008
Source
Asian Journal of Research in Chemistry, Vol 6, No 5 (2013), Pagination: 509-513Abstract
The affinity of crown ether for an alkali and alkaline earth metal ion is dependent on the size of the ring of the crown ether with some exceptions. The crown ether-metal ion binding is enhanced in the absence of non-coplanar donor oxygen atoms and electron withdrawing substituents in the crown ether skeleton. The study of absorption of radio frequency radiation by a magnetic nucleus (I¹0), in the presence of applied magnetic field provides useful information regarding structure of a number of organic and inorganic compounds. The present paper describes preparation and characterization of some Ba(II) complexes with 1,4,7,10,13,-pentaoxacyclopentadecane (15C5), 1,4,7,10,13,16,- hexaoxacyclooctadecane (18C6) and 2,3,11,12-dibenzo-1,4,7,10,13,16,-hexaoxacyclooctadeca-2,11-diene (dibenzo18C6), having five and six donar oxygen atoms respectively. Small but noticeable changes were observed in the chemical shift of 1-H in 15C5, 18C6 and, 1-H as well as 2-H, in dibenzo18C6, which moved downfield upon complexation with barium ion. The metal salts used for complexation are salts of nitrophenols. Products were isolated from barium salts of all the three monoionic ligands, 2-nitrophenol (ONPH), 2,4-dinitrophenol (DNPH), 2,4,6- trinitrophenol (TNPH) and 8-hydroxyquinoline (8HQH). The bonding pattern and structure of complexes were suggested from the studies of elemental analysis, molar conductivity, IR, UV-Vis and 1H-NMR spectral analysis.Keywords
15C5, 18C6, ONPH, DNPH, TNPH, TLC
References
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- Study of Complexation Behavior of Ag(I) Ion with Some Benzocrown Ether Derivatives by Solvent Extraction Method
Abstract Views :229 |
PDF Views:2
Authors
Affiliations
1 PG Department of Chemistry, Ranchi College, Ranchi-834008
1 PG Department of Chemistry, Ranchi College, Ranchi-834008
Source
Asian Journal of Research in Chemistry, Vol 6, No 9 (2013), Pagination: 819-821Abstract
The crown ethers, cryptands, podands and lariat ethers are excellent hosts for accommodating metal ions having similar cationic size as guest ion. The interaction of organic cation donor molecule with crown ethers, cryptands and lariat ethers has not been studied so far. Crown ethers can accommodate cations into their cavities via an ion-dipole interaction. It has been found that size factor of crown ether cavity and cations diameter largely favor the interaction and formation of complexes. In general, oxygen crown ethers are effective for the extraction of alkali and alkaline earth metal ions. The solvent extraction method is extensively used to evaluate the cation binding behavior of crown ethers. Present paper describes synthesis of some benzocrown ether derivatives and their solvent extraction with organic salt of silver ion. In this method, silver ion was extracted by crown ethers from a water phase into an organic phase. The extractability percentage of silver ion (Ag<SUP>+</SUP>) by synthesized crown ethers is reported in this paper.Keywords
Picrate Extraction, NaTNP, AgTNPReferences
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- Synthesis and Characterization of Some Complexes of Strontium (II) with 1,4,7,10,13,16,-Hexaoxacyclooctadecane
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Authors
Affiliations
1 PG Department of Chemistry, Ranchi College, Ranchi-834008, IN
2 Department of Chemistry, Patna University, Patna-800005, IN
1 PG Department of Chemistry, Ranchi College, Ranchi-834008, IN
2 Department of Chemistry, Patna University, Patna-800005, IN
Source
Asian Journal of Research in Chemistry, Vol 4, No 12 (2011), Pagination: 1941-1944Abstract
The present paper describes the preparation and characterization of some strontium ion complexes with 1,4,7,10,13,16,-hexaoxacyclooctadecane (18-crown-6 ether) having six donar oxygen atoms. The strontium metal compounds used for complexation are salts of nitrophenols and 8- hydroxyquinoline. Attempts were made to isolate products from strontium salt of all the three monoionic ligands, 2,4-dinitrophenol (DNPH), 2,4,6-trinitrophenol (TNPH) and 8-hydroxyquinoline (8HQH) with 18-crown-6 ether. It was found that strontium salts and 18-crown-6 ether did bind together, rather than they remain uninteracted. The product in each procedure was chromotographed using TLC. The TLC products were used to identify the interaction and formation of stable compounds. The bonding pattern and structure of complexes were suggested from the studies of elemental analysis, IR, UV and 1H-NMR spectral analysis.Keywords
18-CROWN-6, 8HQH, TLC.- Synthesis and Characterization of Some Crown Ether Complexes of Tl(I) Ion
Abstract Views :192 |
PDF Views:2
Authors
Affiliations
1 PG Department of Chemistry, Ranchi College, Ranchi-834008, IN
1 PG Department of Chemistry, Ranchi College, Ranchi-834008, IN
Source
Asian Journal of Research in Chemistry, Vol 9, No 5 (2016), Pagination: 212-216Abstract
The affinity of crown ethers for metal ion is strongly dependent on the size of the ring of the crown ether. The crown ether-metal ion binding is enhanced in the absence of non-coplanar donor oxygen atoms and electron withdrawing substituents in the crown ether skeleton. The study of absorption of radio frequency radiation by a magnetic nucleus provides useful information regarding structure of a number of organic and inorganic compounds. Small changes were observed in the chemical shift of 1-H in 15C5, 18C6 and, 1-H as well as 2-H, in dibenzo18C6. After formation of the [Metal-Crown ether]Ligand complex, the proton chemical shift δ(-CH2-O- ) shows significant downfield shifts [Δδ(-CH2-O-)= 0.08-0.25 ppm], indicating metal-ligand bond formation. The degree of downfield shift shows the relative strength of the complexes. The 1H-NMR spectrum of dibenzo18C6 shows peaks at, δ1=3.9-4.1 ppm, (16H, 8 -CH2O-), δ2=6.8-7.0 ppm, (8H, aryl -CH-), in CDCl3. The shift of -CH2- signals in complexes from free crown ether unambiguously suggested the coordination of crown ether oxygen of 15C5, 18C6 as well as dibenzo18C6 with thallium ion.
The present paper describes the preparation and characterization of some Tl(I) complexes with 1,4,7,10,13,- pentaoxacyclopentadecane (15C5), 1,4,7,10,13,16,-hexaoxacyclooctadecane (18C6) and 2,3,11,12-dibenzo- 1,4,7,10,13,16,-hexaoxacyclooctadeca-2,11-diene (dibenzo18C6), having five and six donar oxygen atoms respectively. The metal salts used for complexation are salts of nitrophenols. Products were isolated from thallium salts of all the three monoionic ligands, 2-nitrophenol (ONPH), 2,4-dinitrophenol (DNPH) and 2,4,6- trinitrophenol (TNPH) and were chromotographed using TLC. The bonding patterns of complexes were suggested from the studies of elemental analysis, molar conductivity, IR, UV-Vis and 1H-NMR spectral analysis.