I need an image of the IR spectrum of Juglone.

Try this site:
http://spectra.galactic.com/SpectraOnline/Default_ns.htm
Search for the spectrum by its CAS number 83-72-7.

Failing that, this paper could be your best bet.

AU Rostkowska-H, Nowak-M-J, Lapinski-L, Adamowicz-L.
IN Reprints  from:  M  J  Nowak, POLISH ACAD SCI, INST PHYS, AL LOTNIKOW
   32-46, PL-02668 WARSAW, POLAND.
   Research  addresses:  POLISH  ACAD  SCI,  INST PHYS, PL-02668 WARSAW,
   POLAND;
   UNIV ARIZONA, DEPT CHEM, TUCSON, AZ 85721, USA.
TI Molecular   structure   and   infrared   spectra   of  2-hydroxy-1,4-
   naphthoquinone;   Experimental   matrix   isolation  and  theoretical
   Hartree-Fock and post Hartree-Fock study.
SO SPECTROCHIMICA-ACTA-PART-A-MOLECULAR-AND-BIOMOLECULAR-SPECTROSCOPY,
   1998, V54, N8, AUG, pp 1091-1103. ISSN: 1386-1425.

despite what xarqi-ga says, CAS number 83-72-7 is
2-hydroxy-naphthalenedione, not 5-hydroxy- (juglone).  Juglone is CAS
481-39-0.

How right you are.  The same site does have a spectrum for the
5-hydroxy compound under its correct CAS.  The cited paper is of
course, useless.

Please accept my abject apologies if this has caused any
inconvenience.

xarqi