Imaging element containing a blocked photographically useful compound

An imaging element comprising an imaging layer having associated therewith a compound having the following structure:

• wherein:
• PUG is a photographically useful group;
• LINK 1 and LINK 2 are linking groups;
• TIME is a timing group;
• 1 is 0 or 1;
• m is 0, 1, or 2;
• n is 0 or 1;
• 1+n≧0;
• t is 0,1, or 2;
• T is independently selected from a substituted or unsubstituted (referring to the following T groups) alkyl group, cycloalkyl group, aryl, or heterocyclic group, an inorganic monovalent electron withdrawing group, or an inorganic divalent electron withdrawing group capped with at least one organic C1 to C10 group;
• or T is joined with R11 or R12 to form a ring when T is an alkyl, aryl, or heterocyclic group;
• t is 0, 1, or 2, and when t is not 2, the necessary number of hydrogens are present instead;
• a is 1 or 2;
• A is carbon (and then a is 1) or sulfur (and then a is 1 or 2);
• b is 1 or2;
• R11 is hydrogen, or a substituted or unsubstituted alkyl, cycloalkyl, aryl or heterocyclic group or R11 can combine with T to form a ring;
• and
• B is of Structure II:
• wherein “i” nitrogen atoms, “j” nitrogen oxide groups (N+—O−), and “k” CR12 groups combine to form a six-membered heteroaromatic ring;
• “i” is 0, 1 or 2;
• “j” is 0 or 1;
• the sum of “i” and “j” is 1 or 2;
• k is 4 or 5 and the sum of i, j, and k is 6;
• the k R12 groups are independently selected from hydrogen, substituents and, at most only once, a bond joining the six-membered heterocyclic ring with A;
• or R12 can combine with R11 to form a ring;
• additionally, two R12 substituents on adjacent carbon atoms can join to form a fused ring.