T. B. Shah

Coordination Polymers of 1,8-Bis(8-Hydroxyquinolin-5-yl)-2,7-Dioxaoctane

Coordination polymers of a novel bis(oxine) bidentate ligand, namely 1,8-bis(8-hydroxyquinolin-5-yl)-2,7-dioxaoctane (BQDO) (H 2 L), have been prepared with the metal ions Cu(II), Co(II), Ni(II), Mn(II), and Zn(II). The novel bis(bidentate) ligand (H 2 L) was synthesized by condensation of 5-chloromethyl-8-hydroxyquinoline hydrochloride with butylene glycol in the presence of a base catalyst. All of these coordination polymers and the parent ligand were characterized by elemental analyses and IR spectral studies. The diffuse reflectance spectral studies of all of the coordination polymers also were performed. The number-average molecular weights (M n ) of all of the coordination polymers were determined by nonaqueous conductometric titrations. In order to determine thermal stability trend, thermogravimetric parameters, such as T o (initial decomposition temperature), T 10 (temperature for 10% weight loss), T max. (temperature of maximum rate of degradation), IPDT (integral procedural decomposition temperature), and the activation energy E a of the thermodegradation process were calculated. All of the coordination polymers were also characterized by their magnetic susceptibilities.

Synthesis, Characterization and Dyeing Behavior of Oligomeric Trimethylolmelamine-1-naphthol Acid Azo Dyes

The synthesis of oligomeric acid azo dyes A-1 to A-11 was carried out by coupling reaction of trimethylolmelamine-1-naphthol oligomer A, respectively, with diazonium salts of p-aminobenzoic acid, sulphanilic acid and nine different amino naphthalene sulphonic acid derivatives. The chemical structures of the novel coupling oligomer A and all the oligomeric acid azo dyes A-1 to A-11 were established by elemental analysis and spectral studies (IR, UV-visible). The number average molecular weight of oligomer A was estimated by nonaqueous conductometric titration. The dyeability of all of the dyes on wool, silk and nylon fabrics was assessed by exhaustive dyeing, producing attractive shades varying from purple to off-white brown fabrics. The dyeing behavior was evaluated in terms of washing fastness and light fastness properties. It was observed that these novel oligomeric acid azo dyes exhibited attractive brilliant shades with excellent washing fastness and moderate light fastness properties.

Polymeric chelates of epoxy based polyesters containing oxine as pendent groups

Polymer chelates of epoxy based polyester ligands containing oxine as pendent group, have been prepared with different metal ions like Zn +2 , Cu +2 , Ni +2 , and Co +2 . These novel polymer ligands have been synthesized by condensation of 5-chloromethyl-8-quinolinol hydrochloride respectively with epoxy based prepolyhydroxy ester of succinic acid (EPPE-Su) and of sebacic acid (EPPE-Se) in presence of base catalyst. All these polymer ligands and polymer chelates are characterized by elemental analyses, IR and diffuse reflectance spectral studies for their structure determination. The thermal stability of all polymer chelates have been estimated by thermogravimetric analyses (TGA). Besides this, all the polychelates have also been characterized for their magnetic susceptibility and metal to ligand stoichiometry estimation.

COORDINATION POLYMERS OF 1,6-BIS(8-HYDROXYQUINOLIN-5-YL)-2,5-DIOXAHEXANE

Coordination polymers of a novel bis(oxine) bidentate ligand namely 1,6-bis(8-hydroxyquinolin-5-yl)-2,5-dioxahexane (H2L) have been prepared with the metal ions Zn(II), Cu(II), Ni(II), Co(II) and Mn(II). The novel bis(bidentate) ligand (H2L) was synthesized by condensation of 5-chloromethyl-8-hydroxyquinoline hydrochloride with ethylene glycol in the presence of a base catalyst. All of these coordination polymers and the parent ligand were characterized by elemental analyses, IR spectral and diffuse reflectance spectral studies. The thermal stability and number-average molecular weights ([mbar]n) of all of the coordination polymers were determined by thermogravimetric analyses and non-aqueous conductometric titrations, respectively. Besides this, all of the coordination polymers also have been characterized by their magnetic susceptibilities.

Co-ordination Polymers of 1,6-bis(8-hydroxyquinolin-5-yl)-2,5-dioxa-3-methyl hexane

Abstract Co-ordination polymers of novel bis oxine bidentate ligand namely 1,6-bis(8-hydroxyquinolin-5-yl)-2,5-dioxa-3-methyl hexane (BQDMH) have been prepared with different metal ion like Zn+2, Cu+2, Ni+2, Co+2 and Mn+2. The novel bis bidentate ligand (BQDMH) is synthesized by condensation of 5-chloromethyl-8-hydroxyquinoline hydrochloride with propylene glycol in presence of base catalyst. All these co-ordination polymers and parent ligand are characterized by elemental analysis, IR spectra and diffuse reflectance spectral studies for their structure determination. The thermal stability and number-average molecular weight ( M n ) of all these co-ordination polymers have estimated by thermogravimetric analysis and non-aqueous conductometric titration method respectively. Besides this all the co-ordination polymers have also characterized for their magnetic susceptibility and metal to ligand stoichiometry estimation.

Chelates of Poly (8-Hydroxyquinoline-Dimethylolurea)

Novel polymeric chelates of a 8-hydroxyquinoline-based polymeric ligand (H2L), namely 8-hydroxyquinoline-dimethylolurea (HQDMU), were prepared with the metal ions Zn(II), Cu(II), Ni(II), Co(II) and Mn(II). The novel 8-hydroxyquinoline-dimethylolurea (HQDMU) polymeric ligand (H2L) was synthesized by condensation of N,N′-dimethylolurea (DMU) with 8-hydroxyquinoline in the presence of a base catalyst. All the polymeric chelates (ML2) and the parent ligand (H2L) were characterized by elemental analyses and IR spectral studies. The number-average molecular weight of the polymeric chelates and polymeric ligand (H2L) was determined by non-aqueous conductometric titration. The thermal stability of polymeric ligand and chelates was investigated by thermogravimetric analysis (TGA). Thermogravimetric parameters such as T0 (initial decomposition temperature), T10 (temperature for 10% weight loss), Tmax. (temperature of maximum rate of degradation), IPDT (integral procedural decomposition temperature) and the activation energy Ea, of the degradation process were calculated. Besides this, diffusion spectral studies of the polymeric chelates were characterized by determining their magnetic susceptibilities.

Coordination polymers of 1,9-bis(8-hydroxyquinolin-5-yl)-2,5,8-trioxanonane

ABSTRACT Coordination polymers of a novel bis(oxine) bidentate ligand, namely 1,9-bis(8-hydroxyquinolin-5-yl)-2,5,8-trioxanonane (BHQTN) (H2L) have been prepared with the metal ions Zn+2, Cu+2, Ni+2, Co+2, and Mn+2. The novel bis(bidentate) ligand BHQTN was synthesized by condensation of 5-chloromethyl-8-hydroxyquinoline hydrochloride with diethylene glycol in the presence of a base catalyst. All of these coordination polymers and the parent ligand were characterized by elemental analyses and IR spectral studies. The diffuse reflectance spectral studies and magnetic susceptibilities of all of the coordination polymers have also been performed. Thermogravimetric parameters such as To, T10, Tmax., IPDT, and the activation energy of the thermo-degradation process were calculated.

Synthesis, Characterization and Glass-reinforced Composites of Trimethylolmelamine-phenol Resins

Abstract Trimethylolmelamine (TMM) has been prepared and characterized. The TMM condensed with phenol in the presence of alkali catalyst at the varying ratios of TMM: Phenol, viz. 1:1, 1:1.5 and 1:2. The resultant triazine ring containing resins (TMMP) were characterized by elemental analyses, IR spectral studies and thermogravimetry. The isothermal curing study of TMMP resin with hexamethylenetetramine (HMTA) was also carried out. Finally, the glass-reinforced composites based on TMMP-HMTA system have also been prepared and characterized for synergetic property combination of both MF and PF.

Glass Reinforced Composites Based on (Epoxy-Furfural-Acetone) Resin Blends

Abstract A novel Epoxy-furfural-acetonc matrix resin (FA resin) has been developed to prepare glass reinforced composites. The polycondensation reaction of FA resin was carried out in a single step under different experimental conditions. This FA resin is used for blending with epoxy resin in presence of various catalysts. The system has been employed to fabricate glass reinforced composites and the laminates have been characterised by mechanical and chemical properties.

Synthesis, Characterization and Chelating Properties of Poly[4-(8-Hydroxy-5-Quinolinyl)-3-Methyl Butan-2-One]

Abstract Poly [4-(8-hvdroxy-5-quinoIinyl)3-methyIbutan-2-one]s (PQMBs) were prepared by Michael condensation of 8-hvdroxyquinolinyl-5-aldehyde (8-FHQ) and 2-butanone (i.e. Methyl ethyl keton; MEK). The polymers thus obtained are denoted as 8-FHQ-MEK. Several proportions of alkali concentrations were used as catalyst. The resulting polymers were characterized by elemental analysis, IR spectral-studies, number average molecular weight (Mn) and thermogravimetry. Metal chelates of a selected PQMB sample with metal ions viz; Cu+2, Co+2, Zn+2, Cd+2, Mn+2 and Mg+2 have also been prepared and characterized by elemental analysis, IR spectral studies, magnetic moment and thermogravimetry. The electrical conductivity of undoped and iodine-doped polymers and their polychelates has been studied.