The synthesis, structure, vibrational analysis and a comparative vibrational study in function of the structure and the metal-ligand bond strength are discussed for a series of Mn(II)-urea-halogenide complexes. Complex [MnCl2U] has been prepared and studied fur the first time. The single-crystal X-ray structure of the 1:6-bromide complex reveals the presence of octahedral [MnU6](2+) ions and bromide counterions. (C) 2000 Elsevier Science Ltd. All rights reserved.
Instrument dependence and influence of heating rate, mass, ΔH, purge gas and flow rate on the difference between the experimental and programmed temperature of the instrument
作者:R Keuleers、J Janssens、H.O Desseyn
DOI:10.1016/s0040-6031(99)00105-7
日期:1999.7
It has been observed that for endothermic decomposition processes a thermal analysis unit may fail to follow the programmed temperature. A more thorough study shows that the magnitude of the failure of a thermal analysis unit, i.e. the difference between the experimental and programmed temperature, is dependent on the type of the instrument and is also influenced by the heating rate, the mass of the sample, the enthalpy change (Delta H) of the process, the purge gas and the flow rate. (C) 1999 Elsevier Science B.V. All rights reserved.