how to pass Complex List to Controller through Json

var objContactColletion=  [
  {"UserEntity":{"UID":"1","Name":"jhon"},
 { "ContactEntity":{"Cont_ID":"2","Contact_No":"Aron"}
];

   $.ajax({
      type: "POST",
      url: "ContactDetails",
      dataType: "json",
      data: { students: JSON.stringify(objContactColletion) },
      success: function (result) {
          alert('success');
      },
      error: function (result) {
          alert(result.responseText);
      }

  });