Figure 1
The ESI mass spectra (acetonitrile, positive mode, 10−6 M) of (a) Zn2Br3(tpena) and (b) Cu2Br3(tpena). The ion at m/z 317.080 in part (b) is due to the loss of a CH2Py arm and CO2 from [Cu(tpena–CO2–CH2Py)]+ (see Fig. 2 for proposed structure). |