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. 2022 Mar 15;13:1342. doi: 10.1038/s41467-022-29021-0

Table 1.

The thermodynamic characterization of studied systems.

TLLTc −△HLLTc TLLTh △HLLTh Tg TLL BDS Tc −ΔHc Tm ΔHm ν DN
Anion K J g−1 K J g−1 K K K J g−1 K J g−1 nm3 kcal mol−1
[SCN]−

212.1*

211.6**

213.0***

213.3

16.6*

14.9**

12.9***

11.4

207.4*

206.2**

207.5***

207.1

16.6*

15.1**

13.2***

11.6

197.7a

199.1b

 210.3

231.4*

234.2**

251.9***

254.3

38.0*

39.2**

9.51***

1.9

270.8*

267.4**

273.0***

272.3

58.2*

57.0**

18.1***

5.0

0.0405

0.048c

 45.9
[BH4]−

213.8*

214.6**

214.7***

216.1

8.5*

6.4**

5.6***

4.6

206.0*

206.8**

207.3***

207.6

8.3*

6.7**

6.0***

5.0

198.5a

201.3b

 210.9

222.5*

232.7**

242.3***

250.9

51.1*

59.6**

62.8***

34.5

270.7*

271.1**

270.4***

271.9

82.5*

77.4**

73.8***

34.6

0.03

0.046c
[BF4]− – – – – – –

270.0*

229.0

49.3*

21.9

295*

295

61.4*

61.7

0.079

0.07c

 7.3
[TCM]−

206.7*

206.8**

207.1***

207.4

13.1*

12.3**

9.9***

8.1

203.7*

204.4**

204.6***

204.8

13.1*

12.0**

10.2***

8.6

197.7a

196.3b

 203.6 – – – –

0.121

0.093c

 26.1
[TAU]−

214.9*

214.8**

215.8***

216.1

6.0*

4.8**

4.4***

3.8

201.6*

202.1**

203.3***

203.9

6.1*

4.7**

4.1***

3.9

197.5a

199.5b

 206.5 – – – – 0.098c
[BOB]−

213.4*

213.5**

214.5***

216.1

0.64*

0.51**

0.42***

0.38

202.2*

202.8**

203.7***

204.8

1.3*

1.2**

1.1***

0.8

202.1a

198.4b

 – – – – –

0.174

0.164c
[TFSI]−

203.5*

204.3**

204.8***

205.6

8.6*

7.3**

6.5***

5.9

200.5*

200.4**

199.8***

200.1

9.7*

8.2**

7.1***

6.6

195.9a

194.2b

 201.2 – – – –

0.161

0.163c

 11.2

TLL and ΔH denote respectively the temperature and enthalpy of liquid–liquid transition determined during the cooling (c) and heating (h) scan.

An increase of ΔHLLT with a decreased scanning rate indicates that phase 1 needs a certain amount of time to transfer to phase 2.

Tg glass transition temperature, Tc crystallization temperature, Tm melting temperature, ΔHm enthalpy of melting, ΔHc enthalpy of crystallization, v molecular volume of anions.

aThe glass transition temperature was determined from DSC measurements after 6 h aging at 183.15 K with the heating rate 10 K/min.

bThe glass-transition temperature determined from BDS measurements according to definition Tg = T (σdc = 10−14 S/cm).

*1 K/min; **2 K/min; ***5 K/min; Others: 10 K/min.

cThe van der Waals volume was calculated by using the Bondi method.