Express your gratitude while negotiating to help facilitate a successful outcome.
Being gracious in a salary negotiation will get you closer to your salary goal. Psychology research has found that when people feel valued by another person it impacts their motivation to help that person.
When you are negotiating salary express your gratitude for the opportunity, work you have done together, mentorship you may have received, their time, etc. Be genuine in your gratitude. Your graciousness and authenticity will help you get the negotiation results you want.