Activity coefficient effects in spectral and solubility studies of molecular complex equilibriums

1972 ◽  
Vol 94 (19) ◽  
pp. 6861-6862 ◽  
Author(s):  
Sherril D. Christian ◽  
Jerry D. Childs ◽  
Edwin H. Lane
Keyword(s):  
Activity Coefficient ◽  
Molecular Complex ◽  
Solubility Studies

The Measurement of the Activity Coefficient Ratios of Protonated and Neutral Forms of Hammett Indicators in Several Strong Acids

1972 ◽  
Vol 50 (14) ◽  
pp. 2254-2263 ◽  
Author(s):  
T. R. Essig ◽  
J. A. Marinsky
Keyword(s):  
Activity Coefficient ◽  
Linear Relationship ◽  
Water Activity ◽  
Acid Concentration ◽  
Large Range ◽  
Reference Standard ◽  
Neutral Form ◽  
Activity Coefficient Ratio ◽  
Solubility Studies ◽  
Strong Acids

The activity coefficient ratio for several indicators has been estimated for the protonated and neutral forms of the same indicator molecule over a large range of acidity in H2SO4, HClO4, and HCl systems. The activity coefficient (fB) of the neutral form of a number of Hammett indicators was determined via solubility measurements. The observed linear relationship between log fB and [Formula: see text] then permitted estimate by extrapolation of log fB not experimentally accessible for the more basic indicators. Solubility studies of the pentacyanopropenide (PCP−) salts of these more basic protonated indicators were referred to a reference standard, tetraethylammonium pentacyanopropenide (TEA+PCP−) according to the method developed by Boyd to obtain the activity coefficient ratio [Formula: see text] By synthesizing the term [Formula: see text] the approach to a meaningful value of [Formula: see text] is believed to be facilitated. This function is uniquely related to the water activity of the various acid systems examined to support the suggestion by Hammett that [Formula: see text] is a constant for primary aniline indicators at a specified acid concentration.

FOURIER-TRANSFORM MICROWAVE AND MILLIMETERWAVE SPECTROSCOPY OF THE H2-HCN MOLECULAR COMPLEX

2015 ◽  
Author(s):  
Keiichi Tanaka ◽  
Yasuki Endo ◽  
Masakazu Nakajima ◽  
Yoshihiro Sumiyoshi ◽  
Kensuke Harada
Keyword(s):  
Fourier Transform ◽  
Molecular Complex

Effect of association in the vapour phase on the value of activity coefficient

1979 ◽  
Vol 44 (4) ◽  
pp. 1187-1196 ◽  
Author(s):  
Ivona Malijevská
Keyword(s):  
Activity Coefficient ◽  
Binary Systems ◽  
Vapour Phase

The relations were obtained between the thermodynamically consistent activity coefficient of associating component and the activity coefficient calculated irrespective of the association in the vapour phase. The analysis is limited to binary systems with one associating component and is given for the two cases: (a) the associating component dimerizes only, (b) the associating component forms, in addition to a dimer, one higher associate, too.

Anion and solvent controlled growth of crystalline and amorphous zinc(II) coordination polymers and a molecular complex

2021 ◽  
Author(s):  
Claire Deville ◽  
Henrik Særkjær Jeppesen ◽  
Vickie McKee ◽  
Nina Lock
Keyword(s):  
Coordination Polymers ◽  
Molecular Complex ◽  
Research Field ◽  
Metal Coordination ◽  
Controlled Growth ◽  
Bottom Up ◽  
One Dimensional

Controlled bottom-up synthesis of amorphous coordination polymers with tailored metal coordination is a research field in its infancy. In this study, synthesis control was achieved to selectively prepare one-dimensional (1D)...

scholarly journals Polymer Optical Waveguide Sensor Based on Fe-Amino-Triazole Complex Molecular Switches

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 195
Author(s):  
Muhammad Shaukat Khan ◽  
Hunain Farooq ◽  
Christopher Wittmund ◽  
Stephen Klimke ◽  
Roland Lachmayer ◽  
...  
Keyword(s):  
Molecular Complex ◽  
Electromagnetic Interference ◽  
Optical Power ◽  
Uv Curing ◽  
Molecular Complexes ◽  
Core Material ◽  
Absorption Bands ◽  
Electronic Temperature ◽  
Polymer Waveguide ◽  
Temperature Detection

We report on a polymer-waveguide-based temperature sensing system relying on switchable molecular complexes. The polymer waveguide cladding is fabricated using a maskless lithographic optical system and replicated onto polymer material (i.e., PMMA) using a hot embossing device. An iron-amino-triazole molecular complex material (i.e., [Fe(Htrz)2.85(NH2-trz)0.15](ClO4)2) is used to sense changes in ambient temperature. For this purpose, the core of the waveguide is filled with a mixture of core material (NOA68), and the molecular complex using doctor blading and UV curing is applied for solidification. The absorption spectrum of the molecular complex in the UV/VIS light range features two prominent absorption bands in the low-spin state. As temperature approaches room temperature, a spin-crossover transition occurs, and the molecular complex changes its color (i.e. spectral properties) from violet-pink to white. The measurement of the optical power transmitted through the waveguide as a function of temperature exhibits a memory effect with a hysteresis width of approx. 12 °C and sensitivity of 0.08 mW/°C. This enables optical rather than electronic temperature detection in environments where electromagnetic interference might influence the measurements.

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