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- W2078449475 abstract "Abstract The thermal expansion of polycrystalline [Ni(NH3)6](NO3)2 has been measured in the temperature range from 77 to 300 K. Beside volume discontinuities with a phase transition I⇔II at 243 K, a considerable increase in the length of the sample was observed during the transition from phase II to III (1.2%). Vanishing of the phase III on heating takes place gradually and with considerable temperature hysteresis of about 100 K. The anomaly of the phase transition II⇔III is explained based on the assumption of a hydrogen bond of the type N-H…O existing only in the low-temperature phase III. Hydrogen bond energy of about 17 kJ/mol is evaluated. The pressure coefficient dTc2/dp = −1.4 K/MPa results from the Clapeyron-Clausius equation. The phase diagram of [Ni(NH3)6](NO)6 is completed and is compared with those previously obtained for nickel hexammines with other complex anions (ClO-4, BF-4). Effect of [Ni(NH3)6](NO3)2 ageing on the phase transitions is also reported." @default.
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- W2078449475 date "1986-03-01" @default.
- W2078449475 modified "2023-09-26" @default.
- W2078449475 title "Evidence of hydrogen bonds in [Ni(NH3)6](NO3)2" @default.
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- W2078449475 doi "https://doi.org/10.1016/0378-4363(86)90499-7" @default.
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