Second sphere interaction in fluoroanion binding: Synthesis, spectroscopic and X-ray structural study of trans-dichlorobis(ethylenediamine) cobalt(III) terafluoroborate

Binding of fluorine containing anions by new cationic Co(III) complex: Competitive interaction of chloride and hexafluorophosphate with [Co(phen)(H2biim)2]3+

“…The PF 6 À anions possess nearly equal P-F distances ranging from 1.553(4) to 1.593(4) Å , and the geometry around each P atom is almost perfectly octahedral. The Co-N(phen), Co-N(H 2 biim), P-F bond lengths and N-Co-N, F-P-P bond angles are in good agreement with those reported in literature [25,[28][29][30]51,52]. Selected bond lengths and angles are reported in Table 1.…”

“…Literature survey revealed that organic and organometallic based anion receptors have been extensively studied as compared to metal based anion receptors [14][15][16][17][18][19][20][21][22][23][24]. Thus, in continuation of our research program to exploit cobalt(III) complexes as anion receptors (complexants) [25][26][27][28][29][30], we have synthesized a new mixed ligand cationic complex [Co(phen)(H 2 biim) 2 ] 3+ as its chloride salt. The complex cation possesses all the characteristic features [31] of good binding agent: (i) three unit positive charge for effective electrostatic interactions, (ii) hydrogen bond donor groups (C-H and N-H) and (iii) a stable framework onto which these structural components can be assembled.…”

Binding of fluoroanions by a cationic cobalt(III) complex: Syntheses, characterization and single crystal X-ray structure determination of [Co(phen)2CO3]BF4 and [Co(phen)2CO3]PF6·3H2O

“…The 19 F NMR spectrum of 1 showed a peak at À148.08 ppm. Similar signals were observed at À150.0, À155.13 and À155.24 ppm in the 19 F NMR spectra of (phen)Á(Bu 4 NÁBF 4 ), Pb(phen)(Bu 4 NÁBF 4 ) 3 (NO 3 ) 2 [18] and [trans-Co(Cl) 2 (en) 2 ]BF 4 [19] respectively.…”

Second sphere coordination in fluoroanion binding: Synthesis, spectroscopic and X-ray structural study of [Co(phen)2CO3](Pfbz)·6H2O

“…Such endeavors directly or indirectly bring the design and synthesis of anion receptors close to the realm of supramolecular chemistry and profitably utilize the understanding that has been gathered through decades of research on the ''chemistry beyond molecules'' [1][2][3][4][5][6][7][8][9][10]. We [11][12][13][14][15][16] and others [17][18][19][20][21][22] have used these interactions towards anion binding, yet harnessing all the knowledge associated with the binding features of anions is in its incipient stage compared to their cationic counterparts. This inherent difficulty is due to the varied size, shape and pH sensitivity of anions as compared with metal ions.…”