3-Dimetilamino-1-(2-pridil)-2-Propen-1-on Tiyosemikarbazon ve türevlerinin ağır metal komplekslerine ait termodinamik parametrelerinin tayini Determination of thermodynamic parameters of heavy metal complexes of 3-Dimethylamino-1-(2-pyridyl)-2-Propen-1-one Thiosemicarbazone and its derivatives