Abstract
Four coordinated complexes MnxNi(1−x)(C2H6N2O)6SO4 (x=0, 0.33, 0.75, 0.90) were synthesized and characterized. Single-crystal X-ray analysis revealed that the complexes belong to the trigonal crystal family, R-3c space group. Spiral and terraced nucleus growth modes were observed by atomic force microscopy (AFM) in the crystals. Thermogravimetric analysis (TGA) and differential thermal analysis (DTA) measurements showed their excellent thermostability until 200 °C. UV–vis spectra revealed that the transmission peaks of these crystals have a slight bathochromic shift compared to nickel sulfate hexahydrate (NSH), and the transmittance in the UV range increased as the proportion of Mn2+ increased. With their photophysical properties remaining similar, the much higher heat endurance is rendering these crystals better suitable for UV light filter (ULF) applications.
Highlights
Nickel(II) complexes have been widely applied in many regions, for example, catalyzing the synthesis of new compounds [1,2] or being a component of rechargeable batteries [3]
Nickel sulfate hexahydrate (NiSO4 ·6H2 O, nickel sulfate hexahydrate (NSH)) is the most commonly used crystal in UV light filter (ULF), as it has a tremendous absorption from 350 nm to 430 nm in aqueous solution, with a molar absorptivity of 5.13 ± 0.03 mol−1 ·dm3 ·cm−1 at 393 nm over the range from 0.04 to 0.08 mol·cm−3 [4]
The growth of NSH has been promoted to a larger scale with a lower cost, which leads to a wide usage of NSH in opticalphysics, chemistry, communication, and military [6]
Summary
Nickel(II) complexes have been widely applied in many regions, for example, catalyzing the synthesis of new compounds [1,2] or being a component of rechargeable batteries [3]. NSH crystal starts to dehydrate when the temperature reaches 73 ◦ C as a result of weak coordination bonds between the central metal and the O in water ligands [7], which greatly limits its potential applications in some fields, especially under high-temperature conditions. One is to introduce another metal cation into NSH, to obtain a doped or mixed crystal. In 2014, guanidine carbonate-doped NSH crystal, whose dehydration temperature was close to 100 ◦ C, had been investigated by Silambarasan et al [15]. Ni(C6 H12 N4 ) SO4 ·4H2 O crystal, having two of the six water ligands replaced by hexamethylenetetramine, with a better stability and a slight change in absorption band, has been reported recently by Shengmin Gao et al [17]. Differential thermal analysis (DTA) and thermogravimetric analysis (TGA) measurements showed their excellent stability until 200◦ C, indicating the pronounced enhancement in heat endurance compared to NSH
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