Thermoinduced Structural-transformation and Luminescent Conversion in Hybrid Manganese Halides

We report here the synthesis of hybrid manganese halide crystals, (C4H7N2)MnCl3·H2O and (C4H7N2)2MnCl4, by using the same organic ligand 2-methylimidazole. Upon heating treatment, the red-emissive (C4H7N2)MnCl3·H2O crystal is structurally transformed into green-emissive (C4H7N2)2MnCl4 crystal in situ. The crystal structural analysis reveals that the [MnCl5·H2O]3- octahedra chains decompose into mono [MnCl4]2- tetrahedra, accompanied by the departure of H2O molecules. Upon cooling in air or water vapor, the crystal structure and luminescence of (C4H7N2)2MnCl4 are transformed to those of (C4H7N2)MnCl3·H2O. The in situ conversion of luminescence between (C4H7N2)MnCl3·H2O and (C4H7N2)2MnCl4 provides new insight into the potential application of hybrid manganese halides.

Rural Structural Transformation and Agricultural Productivity in Nigeria

Rural structural transformation is best defined as structural changes in the rural areas occasioned by government policies and programmes with the intention of altering the contributions of major sector of the economy for the enhancement of agricultural sector. The study aimed at investigating the impact of rural structural transformation on agricultural productivity in Nigeria. The methodology adopted for the study was Structural Autoregression (SVAR). Six variables of expenditure on education (EXPE), expenditure on health (EXPH), expenditure on electricity (EXPEL), expenditure on telecommunication (EXPTC), expenditure on roads and construction (EXPRC) and expenditure on agriculture (EXPA). Of the six explanatory variables only expenditure on agriculture was found to be negatively related to agricultural productivity, while the others were positively related to it. Several reasons of which of official corruption by the handlers of agricultural funds could possibly be one of the reasons for the negative relationship between expenditure on agriculture and agricultural productivity. Among many other recommendations was the need to provide clinics and health centres to the rural areas, provision of good and accessible roads, provision of electricity and internet facilities. This will act as motivating factors in curbing rural-urban migration, and by extension improve the lots of agricultural productivity in Nigeria. Keywords: rural, structural transformation, agricultural productivity, agricultural policies and structural VAR

Self-evolving materials based on metastable-to-stable crystal transition of polymorphic polyolefin

Living organisms can self-evolve with time in order to adapt to natural environment. Analogically, self-evolving materials also show similar properties based on a non-equilibrium structural transformation. The common design of...