Abstract
This article reports the synthesis and the properties of 5,11,17,23-tetra(t-butyl)-25,27-bis-(ethoxy-1,8-naphthalimide)-26,28-hidroxy-calix[4]arene and the formation of an inclusion compound in organic medium. This functionalized calix[4]arene was conceived as the association of a potential host species with a good fluorophore for optical sensoring purposes. Calix[4]-NI as we will call it, maintains its ‘cone-pinched’ configuration and exhibits typical naphthalimide fluorescence bands in non-polar solvents. Its ability to interact with guest species via hydrogen bonding in its endo-hydrophilic cavity to form inclusion compounds was verified with absorption and fluorescence measurements using N-ethanol-1,8-naphthalimide as guest species, which was projected to fit exactly the host cavity and to interact with its naphthalimide π electrons. For this reason, it was possible to follow the formation of the inclusion compound with electronic spectroscopy.
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[5,11,17,23-tetra(tert-butyl)-25,27-diaminoetoxy)-26,28-(dihydroxycalix[4]arene)] (1) –1H NMR (299.95 MHz): δ(CDCl3)= 7.20 (s,OH, 2H), 7.05 and 6.99 (2s, m-ArH, 4H each), 4.33 and 3.38 (2d, spin AB system, 4H each, 2 J=12.9 Hz), 4.08 (t, OCH 2CH2NH2, 4H, 3 J=6 Hz), 3.15 (t, OCH2CH 2NH2, 4H, 3 J=6 Hz), 2.4 (bs, NH2, 4H), 1.25 and 1.12 (2s, tBu, 18H each). 13C1HNMR (75.42 MHz): δ(CDCl3)=150.07–127.67 (Cq, rings), 125.79 and 125.32 (CH), 78.81 (OCH2CH2NH2), 42.73 (OCH2 CH2NH2), 34.00 (Cq, C(CH3)3), 32.01 (CH2, spin AB␣system), 31.56 and 31.11 (CH3, tBu). Anal. calc. For C48H66O4N2·2H2O: C 74.8, H 9.1, N 3.6; found: C 75.0, H 8.4, N 3.5.
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[5,11,17,23-tetra(tert-butil)-25,27-bis(1,8-N-etoxy-naphthalimide-)-26,28 (dihydroxy)calix[4]arene] (2) – 1H NMR (299.95 MHz): δ(CDCl3)=8.70 (d, 3-CH, 4H, 3 J=7.2 Hz), 8.19 (d, 1-CH, 4H,3 J=8.4 Hz), 7.78 (t, 2-CH, 4H, 3 J=7.6 Hz), 6.99 and 6.71 (2s, m-ArH, 4H), 6.85 (s, OH, 2H), 4.95 (t, OCH2CH 2N, 4H,3 J=7.2 Hz), 4.35 and 3.29 (2d, spin AB system, 4H each, 2 J=13.2 Hz), 4.30 (t, OCH 2CH2N, 4H,3 J=7.0 Hz), 1.28 and 0.89 (2s, tBu, 18H each). 13C1H NMR (75.42 MHz): δ(CDCl3)=164.14 (Cq, C=O), 150.63–141.03 (Cq, rings), 133.88 and 132.25 (CH, naphthalene), 131.35 and 126.90 (Cq, calixarene), 127.83 (CH, naphthalene), 125.40 and 124.86 (CH, calixarene), 122.66 (Cq, naphthalene), 71.96 (OCH2 CH2N), 39.47 (OCH2CH2N), 33.75 (Cq, C(CH3)3), 31.38 (CH2, spin AB system), 31.71 and 30.94 (CH3, tBu). Anal. calc. C:76,7,H:7,1,N:4,7 calc.C:72,76, H:7,4, N:4,85.
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Bagatin, I.A., Cruz, A.T., Toma, H.E. et al. Synthesis of a Naphthalimide Functionalized Calix[4]arene; A Host Type Fluorophore for Inclusion Compounds in Organic Medium. J Incl Phenom Macrocycl Chem 52, 189–193 (2005). https://doi.org/10.1007/s10847-004-6385-2
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DOI: https://doi.org/10.1007/s10847-004-6385-2