Determination of alkali metal cation selectivities of dibenzo-16-crown-5 lariat ethers with ether pendant groups by using electrospray ionization quadrupole ion trap mass spectrometry

Electrospray mass spectrometric studies of the complexational behavior of maleonitrile thiacrown ethers with various metals

“…Electrospray ionization mass spectrometry (ESI‐MS) is a well‐established method for studying complexes in the gas phase and a number of crown ether complexes have thus been studied1–4 using this methodology as thiacrown ethers form stable metal complexes with a range of transition metal ions 5–10. Moreover, the complexational behavior of transition and heavy metal ions with different thiacrowns has also been investigated,11–15 and it has been shown that the equilibrium distribution of thiacrown ether complexes in solution is reflected by the abundances of the ions, e.g.…”

Cryptands with 2,4,6-tris(p-phenylene)-1,3,5-triazine central units and oligoethyleneoxide bridges: synthesis, structure and complexation abilities

“…8,11,14,28,31,34,45,48,20,22,40,60,7 19,23 ]nonahexaconta-1,3(60), 4,6,15,17,19(65), 20,22,24, 26,35,37,39,41,43,52,54,56,58,61,63,66,68- 23, 25,27,29,41,43,45,47,49,61,63,65,67,70,72,75,77-…”

“…17-23 ESI-MS analysis enables us to directly determine the complexes formed in the solution, as well as to study the equilibrium states, carry out quantitative analysis of stability constants or evaluate the binding selectivities. [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] This method is considered to be a ''soft ionization'' process (involving the transfer of solution ions into the gas phase), and therefore typically yields molecular ions with little or no fragmentation at all. The simplicity of spectra obtained using this technique is of great benefit.…”

Metal-ion chemistry of tetra(meso-4-phenoxy-2-picolyl)-calix[4]pyrrole: An extendable super-cavitand tetrapodal ligand

“…ESI-FTICR-MS mass spectroscopy 2 was employed to provide a survey of the range of ions formed with alkali metal chlorides and also the relative selectivity of 1 for each alkali metal ion. This technique has been shown to indicate reliably the composition of the solution phase from which the detected gas phase species were formed [11,[18][19][20][21][22][23]. Fig.…”