Determine the number and symmetry designations of the infrared-active C-O modes in the following derivatives of Mo(CO)_6-

Mo(CO)₅PR₃

cis-Mo(CO)₄ (PR₃)₂

trans-MO(CO)₄ (PR₃)₂

fac-Mo(CO)₃ (PR3)₃

1. Mo(CO)₅PR₃:

   • This complex has C₄v symmetry.
   • The CO stretching vibrations split into A₁ _______ ___ _______ _________ __________ ___ _________ _______ _________ __________.
     ___ ___ ____ _________ ___ _____ _________ ________ ____ _____ __________.
     _______ _______ __________ _____ ______ ____ ____ ________ __________.
     __________ ___ ______ __________ ______ _________ ______ _______ _______ ___.
     __________ ________ _______ _______ ____ _______ __________ _______.
     ________ ________ _________ __________ ___ _____ ______ ______ _______.
     __________ _______ _______ _____ ____ _________ _____ ______.
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