Fig. 5: Correlation between CCSN2 and adjusted mass (mad) for all species in Table 1.
From: Formation and characterization of polymetallic {CrxMy} rings in vacuo
The cyclic complexes show a linear correlation, which does not hold for the acyclic ions ({Cr12Gd4} and {Cr6Mn} horseshoes). 1: {Cr5Cu}; 2: {Cr5Gd2}; 3: {Cr5Cu2}; 4: {Cr6Cu}; 5, 6: {Cr6Mn} rings. The mass was adjusted so that every metal centre is accounted for with the mass of chromium (52 Da). This model is reasonable as the nature of the metal in the polymetallic complex has a low overall impact on the CCSN2, although some have high masses, for example in the case of Gd. Inset: schematics of selected cyclic and acyclic complexes (Cr, green; Cu, brown; Gd, purple; Mn, black). Fragment ions that are assigned as closed, due to the ion mobility data, are presented schematically; the IM–MS experiment informs on the stoichiometry but not on the exact connectivity between the metal centres. ESD derived from CCSN2 values versus mad (black circles, cyclic; blue squares, acyclic), showing that the acyclic {Cr6Mn} horseshoes and {Cr12Gd4} have a lower ESD than the cyclic species.
