The Austrian composer Arnold Schoenberg published four string quartets, distributed over his lifetime. These were the String Quartet No. 1 in D minor, Op. 7 (1905), String Quartet No. 2 in F sharp minor, Op. 10 (1908), String Quartet No. 3, Op. 30 (1927), and the String Quartet No. 4, Op. 37 (1936).
String Quartet No. 2 was not in D minor.