This study examined sustainable international financial flows. The study specifically examined the effect of foreign direct investment inflows, foreign direct investment outflows, remittance inflows and remittance outflows on the development of Nigeria economy. Panel Least Square Regression analysis was used to analyse the secondary data collected for the study and also to test the four null hypotheses formulated for the study. Durbin Watson Statistics (DW) test was also used to test the presence of autocorrelation in the models of the study. The findings reveal that all the independent variables, namely, foreign direct investment inflow, foreign direct investment outflow, remittance inflow and remittance outflow positively and significantly affect Gross Domestic Product of Nigeria. Based on these findings, it was recommended that The Nigerian government should encourage the inflows of foreign direct investment and contact policy institutions that can ensure the transparency of the operations of foreign companies within the economy, Government should ensure that remittance inflows accruable to Nigeria is properly managed to the development of Nigeria economy. Nigerian government should equally budget for remittance outflow as it helps in reduction of poverty.

Two derivatives of benzo-hetreocyclic ligands (3H-Benzooxazole-2,2-dithiol and 3H-Benzothiazole-2,2-dithiol) were synthesized by refluxing one mole of 2-Amino-phenol with one mole of carbon disulphide (CS2) in acetone, then one mole of 2-Amino-benzene-thiol and one mole of carbon disulphide (CS2) in acetone for two hours respectively. The mixture were allowed to cool and then evaporated at room temperature, to afford a solid creamy precipitates which were washed with hexane, filtered, air dried and recrystallized with a mixture of acetone and hexane. The final product were filtered and allowed to dry. Infrared spectroscopy (IR) was used to confirm the functional groups associated with the ligands. The ability of the synthesized ligands to remove heavy metals (Fe, Cu, Zn and Ni) ions from aqueous solutions was investigated. This was carried out at five different pH values to monitor its effect on heavy metal removal. The metal salts and the synthesized ligands were dissolved in the same solvent (ethanol) and a ligand-metal ratio of 1:1 used in the investigation. The 3H-Benzooxazole-2,2-dithiol ligand, was observed to exhibit highest percentage metal removal efficiency for Nickel at pH value  3.00 giving the 90.76% removal. The 3H-Benzothiazole-2,2-dithiol exhibited the highest removal efficiency for zinc at pH 11.00, giving a percentage of 95.64%. (11.0) Though both ligands were effective in metal removal, the 3H-Benzothiazole-2,2-dithiol ligand showed better percentage removal efficiencies (67.96% - 95.64%).