Qualitative analysis of Cu2+, Co2+, and Ni2+ cations using thin-layer chromatography.
The M(DEDTC)2 (M = Cu, Co, or Ni) and M(PyDTC)2 (M = Cu or Co) complexes prepared by reactions of sodium diethyldithiocarbamate and ammonium pyrollidinedithiocarbamate with metal (II) nitrates are examined for qualitative analysis and separation using thin-layer chromatography systems. These complexes and their mixtures are spotted to the activated thin layers of silica gel 60GF254 (Si-60GF254) with a 250-microm thickness. Pure toluene and a toluene-cyclohexane mixture (3:1, v/v) are used as mobile phases for running of the complexes. These chromatographic systems are successfully used for qualitative analysis of corresponding metal cations and separation of components in both M(DEDTC)2 and M(PyDTC)2 complex mixtures.
Linkage between separation of Cu2+, Co2+, and Ni2+ on TLC and crystal field theory.
M(DEDTC)2 (M = Cu, Co, or Ni) and M(PyDTC)2 (M = Cu or Co) complexes prepared by reactions of sodium diethyldithiocarbamate (NaDEDTC) and ammonium pyrrolidinedithiocarbamate (NH4PyDTC) with metal (II) nitrates are examined for qualitative analysis and separation using thin-layer chromatography (TLC) systems in the literature. Already known separability of metal cations cited and their complexes are reexamined and discussed in the context of relation to the crystal field theory (CFT) and TLC as a new approach and adaptation. Because the chromatographic data have been agreed on with assumptions of CFT, it is concluded that CFT is closely related to the TLC separation of these metal cations and their complexes. Therefore, this study may be useful in understanding of the linkage between the CFT on coordination chemistry and the chromatographic parameters [e.g., retention factor (Rf) and theoretical plate numbers (N)] of the complexes.
Male/female ratio in electroantennogram responses of the american cockroach to (+)-trans-verbenyl acetate and related compounds: Relationship between the ratio and sex pheromonal activity☆
Abstract 1. 1. The male/female (M/F) ratio in the EAG response of the American cockroach were evaluated for the sex pheromone mimic, (+)- trans -verbenyl acetate, and its analogs, using the male and female EAG amplitudes at 50 μg on the lines which indicate the dose effect on the EAG amplitudes. 2. 2. The ratio values were related to the potency of sex pheromonal activity of the compounds. 3. 3. The ratio value increased with increase of pheromonal activity. 4. 4. The pheromonally inactive analogs were regarded as general odors from their small M/F ratio values.