scholarly journals Thermochemical Studies on Metal Complexes. IX. Free Enerrgy, Enthalpy, and Entropy Changes for Stepwise Formation of Zinc(II) Halide Complexes in Aqueous Solution.

1969 ◽  
Vol 23 ◽  
pp. 1695-1703 ◽  
Author(s):  
Per Gerding ◽  
Birgitta Dahlén ◽  
H. M. Seip ◽  
Tord Holme ◽  
Alf A. Lindberg ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Metal Complexes ◽  
Entropy Changes ◽  
Halide Complexes ◽  
Enthalpy And Entropy Changes ◽  
Enthalpy And Entropy ◽  
Stepwise Formation

scholarly journals Complex Formation Equilibria between Ag(I) and Thioureas in Propan-2-ol

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Domenico De Marco
Keyword(s):  
Complex Formation ◽  
Background Electrolyte ◽  
Complex Formation Equilibria ◽  
Entropy Changes ◽  
Enthalpy And Entropy Changes ◽  
Formation Equilibria ◽  
Enthalpy And Entropy ◽  
The Stability ◽  
Tetramethyl Thiourea ◽  
Stepwise Formation

The complex formation equilibria between Ag(I) and thiourea (Tu), N methyl-Thiourea (MeTu), N,N′-dimethyl-Thiourea (Me2Tu), N,N,N′,N′ Tetramethyl-Thiourea (Me4Tu), N-ethyl-Thiourea (EtTu), N,N′ diethyl-Thiourea (Et2Tu), and N,N′-Ethylen-Thiourea (EnTu) in propan-2-ol as solvent medium have been investigated by potentiometry within the temperature range 10°C–40°C and self-determined ionic medium by (AgNO3) concentration range 6.36·10-6–3.83·10-5 m·dm−3 (no background electrolyte added). The experimental results can be interpreted with the stepwise formation of tris-coordinated complexes AgLn  (n=1–3; hereafter charge is omitted). The stability constants log βn and the standard thermodynamic changes in enthalpy (ΔHn°) and entropy (ΔSn°) for overall complex formation reactions AgI+nL=AgLn (n=1–3) have been evaluated. The reactions are exothermic in nature and entropy disfavored for all the investigated ligands. The standard enthalpy and entropy changes for the stepwise reactions AgLn-1+L=AgLn have been evaluated by difference ΔΔHn°=ΔHn°-ΔHn-1° and ΔΔSn°=ΔSn°-ΔSn-1°. The stepwise enthalpy are mutually linearly related to the corresponding entropy changes with isoequilibrium temperatures Tiso=285, 305, and 363 K for n=1, 2, or 3 respectively.

scholarly journals Direct measurement of enthalpy and entropy changes in NH3 promoted O2 activation over Cu‐CHA at low temperature

ChemCatChem ◽  
2021 ◽  
Author(s):  
Xueting Wang ◽  
Lin Chen ◽  
Peter N. R. Vennestrøm ◽  
Ton V. W. Janssens ◽  
Jonas Jansson ◽  
...  
Keyword(s):  
Low Temperature ◽  
Direct Measurement ◽  
O2 Activation ◽  
Entropy Changes ◽  
Enthalpy And Entropy Changes ◽  
Enthalpy And Entropy
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