384 SIE WILLIAM CROOKES ON SCANDIUM. 



Theory. 



Sc 44-10 5-76 



26C 312-00] 88 . 99 



23H .... 23-18 I 



HO 176-00 r 631'36 82'47 82'15J 



4N 56-04 



28 64-14^ 



5H 2 O .... 90-08 H-77 1179 ll'Ol 



765-54 100-00 lOO'OO lOO'OO 



SCANDIUM OCTAMETHYLTETRAMINODIHYDROXYPARADIXANTHYLBENZENETETRA- 



CARBOXYLATE. 



, 



X)0-8c :0 



COO X 



>ScOH }* - 



COO 



\coo> OH 



Naturally this is a question of considerable scientific interest. How would 

 scandium behave when combined as a salt with a highly complex acid ? In 

 Dr. SILBERRAD'S recently published paper on " The Condensation Products of Mellitic 

 Acid with Meta-amino Phenol,"* some highly complex bodies are described ; it 

 became interesting to determine precisely what basicity scandia would assume 

 towards polycarboxylic acids of this nature. 



By the kindness of Dr. SILBERRAD I have had an opportunity of experimenting 

 with octamethyl tetramino dihydroxy paradixanthyl benzene tetracarboxylic acid. 



Previous experiments would lead one to expect the scandium salt of this acid to 

 have the composition C 44 H 40 Oi 4 N 4 Sc 2 . This I could not prepare, the salt produced by 

 metathesis containing more scandium than this formula admits of. The only scandium 

 salt I could form of this acid has the composition shown above. 



Octamethyl tetramino dihydroxy paradixanthyl benzene tetracarboxylic acid is a dark 

 red powder, insoluble in water and easily soluble in dilute ammonia. The solution in 

 ammonia, very slightly alkaline, is exactly neutralised with acetic acid ; to the hot 



* ' Journ. Am. Chem. Soc.,' Feb., 1910, No. 2, p. 189, 



