NOPR Collection:

A molecular mechanics study on the structure of CH₃OOCCH₂CH₂CO(DH)₂H₂O [DH = dimethylglyoximate mono anion]

Wed, 01 Sep 1999 00:00:00 GMT

Title: A molecular mechanics study on the structure of CH₃OOCCH₂CH₂CO(DH)₂H₂O [DH = dimethylglyoximate mono anion] Authors: Lewis, Nita A; Datta, Dipankar Abstract: The logK, ∆H and ∆S values for the equilibrium displacement of the axial water molecule in alkylaquocobaloximes [RCo(DH)₂H₂O; DH≡ dimethylglyoximate mono anion] by dimethoxyethylamine in aqueous medium are found to correlate Taft's σ* parameter mixed with Dubois’ steric parameter E'_s’ for a number of R groups except for CH₂CH₂COOCH_3. To investigate the reason, the structure of CH₃OOCCH₂CH₂Co(DH)_2.H₂O (1) has been determined by molecular mechanics. It is found that the alkyl group in 1 has a bent conformation which allows H-bonding between the carbonyl oxygen atom and the equatorial oximate H atom. This possibly changes the steric and electronic effects of the alkyl group in 1. It is mentioned that the X-ray crystal structure of the cobaloxime .1 is not yet known. Page(s): 921-924

Synthesis and characterization of cryptates of Sc(III) and La(III) with hexabenzocryptand

Wed, 01 Sep 1999 00:00:00 GMT

Title: Synthesis and characterization of cryptates of Sc(III) and La(III) with hexabenzocryptand Authors: Dong, Wenkui; Yang, Rudong; Yan, Lan Abstract: Three novel solid cryptates of a cage-type N₂O₆-heteroatom hexabenzocryptand (L) with RE(III) (RE=Sc,La) chlorides and lanthanum nitrate respectively have been synthesized and characterized by IR and ¹H NMR spectra. TG-DTA analyses and molar conductances. The composition of these cryptates has been determined as RE₂Cl₆L.4H₂O (RE =Sc, La) and La₂ (NO₃)₆L.2H₂O. Page(s): 880-883

First example of a carboxylato bridged Zn(II) polymer: Synthesis and structure of [Zn(dien)(CH₃CO₂)]_n(CIO₄)_n (dien ≡ diethylenetriamine)

Wed, 01 Sep 1999 00:00:00 GMT

Title: First example of a carboxylato bridged Zn(II) polymer: Synthesis and structure of [Zn(dien)(CH₃CO₂)]_n(CIO₄)_n (dien ≡ diethylenetriamine) Authors: Tocher, Derek A; Patra, Goutam K; Naskar, Jnan P; Datta, Dipankar Abstract: The title compound crystallises in the space group Pna2₁ with Z = 4. X-ray crystal structure shows that it is composed of a quasi-one- dimensional polymeric chain cation [Zn(dien)(CH₃CO₂)]_nⁿ⁺ and perchlorate anions which are not bonded to the metal atoms. Each Zn atom is connected to two others in a chain by a single acetate bridge. The acetate group here adopts a syn- anti as well as a monoatomic bridging mode. The Zn(II) ion in each individual cation [Zn(dien)(CH₃CO₂)]⁺ has a distorted octahedral N₃O₃coordination sphere. It is isostructural with its copper(II) counterpart , [Zn(dien)(CH₃CO₂)]_n(CIO₄)_n . Page(s): 870-873

Synergistic extraction of indium(III) by β-hydroxynaphthaldoxime neutral donor combination

Wed, 01 Sep 1999 00:00:00 GMT

Title: Synergistic extraction of indium(III) by β-hydroxynaphthaldoxime neutral donor combination Authors: Biswas, S; Basu, S Abstract: Synergistic effect of various neutral donors on the β-hydroxynaphthaldoxime extraction of In(III) spiked with ^114mIn into amyl alcohol has been reported. Synergistic coefficient and adduct formation constant s are calculated from distribution measurement. Page(s): 969-972

NOPR Collection:

A molecular mechanics study on the structure of CH3OOCCH2CH2CO(DH)2H2O [DH = dimethylglyoximate mono anion]

Synthesis and characterization of cryptates of Sc(III) and La(III) with hexabenzocryptand

First example of a carboxylato bridged Zn(II) polymer: Synthesis and structure of [Zn(dien)(CH3CO2)]n(CIO4)n (dien ≡ diethylenetriamine)

Synergistic extraction of indium(III) by β-hydroxynaphthaldoxime neutral donor combination

A molecular mechanics study on the structure of CH₃OOCCH₂CH₂CO(DH)₂H₂O [DH = dimethylglyoximate mono anion]

First example of a carboxylato bridged Zn(II) polymer: Synthesis and structure of [Zn(dien)(CH₃CO₂)]_n(CIO₄)_n (dien ≡ diethylenetriamine)