You can build an expression tree which contains a bitwise complement operation using Expression.Not method. For example, you have the following code.
bool value = false;
Console.WriteLine(!value);
Here is the code that is required to build the same functionality using expression tree.
Expression greaterThanExpr = Expression.Not(
Expression.Constant(false));
Console.WriteLine(Expression.Lambda<Func<bool>>(greaterThanExpr).Compile()());