The phrase "different chemistry" refers to a situation or relationship where there is an incompatibility, often due to conflicting personalities or interests. Full definition
I've been in lots of different chemistry departments now and this is a very good one, I would say. (sciencemag.org)
The links between the nodes of different chemistry disciplines are darker than other links because the disciplines tend to contain the same papers. (discovermagazine.com)
Figure 1 shows the different atmospheric layers each defined by temperature changes that reflect different chemistry. (drtimball.com)