Water replacement on a world with a nitrogen-rich atmosphere

The planet in question is this one. The atmosphere mainly consists of nitrogen and is approximately a quarter the density of Earth's; I chose surface temperatures ranging from -50Â°C to 0Â°C.

I need a compount which effectively "replaces" water on this planet. Any compounds similar to Water in their composition and their chemical reactions, with oxygen replaced by nitrogen, are welcome; I looked up Azanide (H2N) but could not find information about its chemical and physical properties.

A modification of the surface temperature is allowed, which means that compounds with evaporation temperatures between -100Â°C and -50Â°C are permitted too. The difference between the melting and evaporation temperature must be as big as possible.

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Water replacement on a world with a nitrogen-rich atmosphere

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