First X-ray structure of hexaamminecobalt(III) salt with complex fluoroanion: Synthesis and characterization of [Co(NH3)6]X·SiF6·nH2O, where X=Cl, Br, I and NO3 and crystal structure of [Co(NH3)6]Cl·SiF6·2H2O

Second sphere coordination in anion binding: Synthesis, spectroscopic characterization and single crystal X-ray structure determination of hexaamminecobalt(III) dichloride tetrafluoroborate

“…We envisaged that, if cations and anions are properly functionalized to incorporate hydrogen bonds, novel network architectures may ensue and stabilize the lattice. Although the synthesis and single crystal X-ray structure determinations of a variety of hexaamminecobalt ( 2À which was recently reported by our group [21]. The present work reports synthesis, spectroscopic studies and single crystal X-ray structure determination of [Co(NH 3 ) 6 ]Cl 2 ÁBF 4 in continuation of our interest [22] in hexaamminecobalt(III) complex salts.…”

“…The title complex salt is stabilized by extensive hydrogen bonding besides electrostatic forces of attractions. We have already reported the potential use of cationic hexaamminecobalt(III) as anion receptor for inorganic oxo-anions [22a-d], organic oxoanions [22e-g] and fluoroanions [21].…”

Ammonium, Alkylammonium, and Amino Acid Complexes of a Hexacopper Fluoro‐Metallacrown Cavitand

“…No contact-shifted peaks were detected in the 19 F or 23 Na NMR spectra of [Na&1A C H T U N G T R E N N U N G (CH 2 Cl 2 ) 2 ]HF 2 in CD 3 NO 2 . [6,36] Rather, the 19 F spectrum only showed peaks assignable to one or more of the following inorganic anions: SiF 6 2À (d = À130 ppm, s [37] ); BF 3 OH À (d = À146 ppm, JA C H T U N G T R E N N U N G { 11 B-19 F} = 15 Hz [38] ); and, a peak at d = À154 ppm (JA C H T U N G T R E N N U N G { 1 H-19 F} = 35 Hz) which we assign to a mixture of F À (d = À150 ppm in CD 3 NO 2 [39] ) and HF 2 À (d = À154, JA C H T U N G T R E N N U N G { 1 H-19 F} = 120.5 Hz in the same solvent [40] ) in rapid chemical exchange. The putative SiF 6 2À and BF 3 OH À content of the samples would arise by leaching from the borosilicate glass NMR tubes by free fluoride in the solutions.…”

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.…”

“…There is also an added advantage as cobalt(III) salts are easier to synthesize in excellent yields from readily available materials, they are stable at room temperature for months and do not decay under X-ray exposure. Moreover, the cationic complex cation, [Co(phen) 2 CO 3 ] + fulfils all the basic criteria [51,52] to be an anion receptor, it has (i) unit positive charge for electrostatic interaction, (ii) large number (16) of C-H hydrogen bond donor groups and (iii) stable framework onto which the anionic group can be assembled. In all probabilities, these chosen ions would form an intricate network of weak interactions which may enable us to examine the role of weak C-HÁ Á ÁF and FÁ Á ÁF interactions as a synthetic strategy to generate molecular networks.…”