So far we don't know exactly what you think is wrong with your maple, a type of tree that normally has a wide leaf color range. It's premature to suggest or use any product. Could just be heat damage that more water and a shade canopy will fix, or something more serious, but we need more info.
Can you send us better photos, closer and focused on exactly the leaves or parts that you're concerned about? Also, areas of the tree (leaves especially) that look normal to you — ie the way you're accustomed to them looking — for comparison? Get lower and send a side view of the tree as well as where the trunk emerges from the soil. Tell us:
How old is the tree,
What your weather has been like this summer,
What sun exposure does the tree have,
How often, how much you water,
If you've fertilized it, with what and how much, how frequently.
