Table 1. ESI-MS spectra of PBDs (PBD1 and PBD2) and TMPyP4 with G-quadruplex DNA with m/z (Relative abundances) and stoichiometry.
| G-quadruplex | Ligand | m/z (Relative abundance) | Charge of the complex | Quadruplex∶Ligand |
| d(T2G8) | No ligand | 473 (100) | [QT+2K−H]27− | 1∶0 |
| 593 (30) | [QT+9K−H]22− | 1∶0 | ||
| 930 (15) | [QT+8K−H]14− | 1∶0 | ||
| 1060 (27) | [QD+NH4−3H]6− | 1∶0 | ||
| 1278 (12) | [QD+2NH4−H]5− | 1∶0 | ||
| 1597 (11) | [QD+2NH4−2H]4− | 1∶0 | ||
| d(T2G8) | PBD1 | 473 (100) | [QT+2K−H]27− | 1∶0 |
| 516 (15) | [QT+PBD1+5K−H]26− | 1∶1 | ||
| 530 (23) | [QT+PBD1+K−H]25− | 1∶1 | ||
| 545 (23) | [QT+10K−H]24− | 1∶0 | ||
| 562 (75) | [QT+PBD1+7K−H]24− | 1∶1 | ||
| 578 (15) | [QT+PBD1+2K−H]23− | 1∶1 | ||
| 592 (28) | [QT+8K+NH4−H]22− | 1∶0 | ||
| 608 (3) | [QT+PBD1+4K−H]22− | 1∶1 | ||
| 622 (3) | [QT+9K+NH4−H]21− | 1∶0 | ||
| 638 (3) | [QT+PBD1+4K−H]21− | 1∶1 | ||
| 652 (2) | [QT+9K−H]20− | 1∶0 | ||
| 1060 (4) | [QD+NH4−3H]6− | 1∶0 | ||
| 1277 (2.6) | [QD+2NH4−2H]5− | 1∶0 | ||
| 1597 (2) | [QD+2NH4−2H]4− | 1∶0 | ||
| d(T2G8) | PBD2 | 473 (60) | [QT+2K−H]27− | 1∶0 |
| 561 (17) | [QT+PBD2+5K−H]24− | 1∶1 | ||
| 575 (100) | [QT+PBD2+NH4−2H]23− | 1∶1 | ||
| 593 (30) | [QT+9K−H]22− | 1∶0 | ||
| 607 (82) | [QT+PBD2+2K−H]22− | 1∶1 | ||
| 653 (4) | [QT+9K−H]20− | 1∶0 | ||
| 667 (4) | [QT+PBD2+2K−H]20− | 1∶1 | ||
| 1060 (3) | [QD+NH4−4H]6− | 1∶0 | ||
| 1278 (1.0) | [QD+2NH4−H]5− | 1∶0 | ||
| 1597 (0.5) | [QD+2NH4−2H]4− | 1∶0 | ||
| d(T2G8) | TMPyP4 | 473 (100) | [QT+2K−H]27− | 1∶0 |
| 592 (5) | [QT+8K+NH4−H]22− | 1∶0 | ||
| 721 (15) | [QT+7K−H]18− | 1∶0 | ||
| 793 (30) | [QT+TMPyP4+6K−2H]18− | 1∶1 | ||
| 853 (27) | [QT+2K+NH4−H]15− | 1∶0 | ||
| 930 (7) | [QT+8K−H]14− | 1∶0 | ||
| 1174 (0.3) | [QT+TMPyP4+NH4−H]12− | 1∶1 | ||
| 1284 (2.6) | [QT+TMPyP4+3NH4−H]11− | 1∶1 | ||
| 1597 (0.4) | [QD+2NH4−2H]4− | 1∶0 |