Level shifting 8 output IO Expander from 0V-5V to -2.3V to +2.3V
See below. When the input is at 0V, Q1 is on, the output voltage is pulled up to +2.3V. When the input is at 5V, the output is at -2.3V. Note the logic reversal.  

You can use dual transistors etc.- they're not critical.