Chloro-(2,2',2 " -terpyridine)platinum(II) chloride dihydrate, [Pt(terpy)Cl
]Cl . 2H(2)O, crystallizes from aqueous EtOH (1:1) as a yellow dimorph, but
from dilute (1 M) HCl as its less stable red dimorph. X-ray powder photogr
aphy shows that, above 100 degreesC, the red form converts into the yellow
form.