Table 3 Standard partial molar volumes (\(~V_{\varphi }^{0}~\)), adjustable parameter of Eq. 2 (\(~{S_v}~\)) and standard deviations (\(\sigma (~v_{\varphi }^{0}~)\)) for GBP in aqueous solutions of betaine-based compounds at 298 K.a

From: Gabapentin drug interactions in water and aqueous solutions of green betaine based compounds through volumetric, viscometric and interfacial properties

am

(mol kg−1)

106 \(~V_{\varphi }^{0}~\)

(m3 mol−1)

106Sv

(m3 mol−2kg)

(\(\sigma (~V_{\varphi }^{0}~)\))

Betaine

0.0098

138.677 ± 0.050

64.835 ± 0.300

0.04

0.0297

142.010 ± 0.015

31.385 ±0. 631

0.02

0.0501

142.916 ± 0.040

8.232 ± 0.800

0.09

DES (betaine-urea 1:2)

0.0103

141.695 ± 0.054

67.432 ±0. 333

0.07

0.0299

142.292 ± 0.0751

31.835 ± 0.160

0.10

0.0501

142.407 ± 0.030

39.798 ± 0.894

0.04

IL (betaine octyl ester chloride)

0.0103

140.664 ± 0.070

43.886 ± 0.796

0.01

0.0294

141.481 ± 0.093

76.856 ± 0.213

0.03

0.0496

141.791 ± 0.137

93.956 ± 0.931

0.08

  1. The standard uncertainties for molality, temperature and pressure were u (m) = 0.001 mol kg−1, u (T) = 0.2 K, u (P) = 10.5 hPa, respectively with level of confidence 0.95. The standard combined uncertainty for density and apparent molar volume were about, uc (ρ) = 0.06 × 10−3 g cm−3 and uc(Vφ) = 5 × 10−5 m3 mol−1 (level of confidence 0.68), respectively.
  2. aThe molality of the prepared betaine compound in water (solvent).
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