Ni(C_6H_(12)N_4)_2SO_4·4H_2O晶体的生长、热学和光谱性质

Growth,Thermal and Spectrum Property of Ni(C_6H_(12)N_4)_2SO_4·4H_2O Crystals

六次甲基四胺（C6H12N4,HMTA）部分取代六水合硫酸镍（NSH）晶体结构中的配位水,合成Ni（C6H12N4）2SO4·4H2O（NSH-HMTA）晶体材料。采用称量法测定了NSH-HMTA晶体的溶解度曲线,应用水溶液降温法在温度区间56~44℃之间生长出6 mm×6 mm×2 mm尺寸的晶体,生长速度约为0.5 mm/d。通过等离子发射光谱分析所生长晶体中镍离子含量,X射线单晶衍射用于验证晶体的结构。采用热重法（TGA）和差热分析法（DTA）测定晶体脱水温度和分解温度分别为93℃、114℃。测量晶体的紫外-可见光谱特性,其紫外波段透过峰位于波长为307 nm处,比NSH晶体（287 nm）红移了约20 nm,HMTA与Ni2＋配位提高了Ni2＋的3A2g光谱项的能级,3A2g→3T1g（P）所需能量更低,导致吸收谱红移。

The new material,Ni（ C6H12N4）2SO4·4H2O,was synthesized through HMTA molecules substituting for part coordinated water molecules. The content of Ni2 ＋was determined by ICP while its structure was acquired through X-ray single crystal diffraction,conforming to molecular formula. The solubility curve of title complex was measured at various temperatures by weighing method and bulk single crystals（ 6 mm × 6 mm × 2 mm） were obtained from aqueous solution by falling temperature growth technique due to its solubility being directly proportional to temperature（ 56-44 ℃）. The dehydration（ 93℃） and decomposing（ 114 ℃） temperatures were determined by Thermo Gravimetric Analyzer（ TGA）and Differential Thermal Analysis. The UV transmission peak was red-shifted about 20 nm due to the improving of3A2 gspectral term for Ni2 ＋.