| http://www.w3.org/ns/prov#value | - The diazonium salts useful in the present invention are those represented by the formula: ##STR1## wherein R1 represents an electron withdrawing group (preferably either F, Cl, Br, I, or NO2), M is an element selected from the group consisting of B, P, As, Sb, Bi, and Sn, n is 4, 5, or 6, and x is 1, 2, or 3.
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