In a large saucepan heat the tangerine juice and sugar, whisking until sugar is completely dissolved.
Stirring consistently, add in the Maggi seasoning sauce and chipotle chiles, cook for an additional 3 to 4 minutes. Do not boil.
Remove the marinating mixture from the heat and let it cool.
Place chicken thighs in a large freezer bag, carefully pour in marinating mixture, seal, and refrigerate for 12 hours.
Preheat grill or broiler.
Grill or broil chicken for about 7 minutes on each side or until no longer pink in the center. The chicken thighs should have an internal temperature of 165 F degrees. If you do not have a thermometer, pierce a thigh with a knife and if the juice runs clear, the thighs are cooked.