Synthesis and Complexation Properties of Novel Biscalixarene Composed of Calix[4]arene and Thiacalix[4]arene Subunits

Biscalixarenes, as examples of higher order molecular architectures than normal calixarene derivatives, were studied extensively in the recent years due to they possess two calixarene cavities which have the potential for complexing with two guests in two…     

Synthesis and Complexation Abilities of Novel Multiple-Sites Calix[4]arene Receptors: Calix[4]arene Derivatives with Anthraquinone Groups on Lower Rims and Hydrazone Groups on Upper Rims

By formylation of 1,3-bisubstituted calix[4]arene anthraquinone derivative 1 in hexamethylenetetramine/trifluoroacetic acid system, the corresponding formylated gecalix[4]arene anthraquinone derivative 2 was synthesized in yield of 63%. By further reacting compound 2 with salicylic hydrazide, 2,4-dinitrophenyl hydrazine, nicotinyl hydrazine or phenyl thiosemicarhazide, novel calix[4]arene derivatives with anthraquinone and hydrazone groups 3a–3d were obtained in yields of 74–83%. The extracting experiments for series of metallic cations showed that compounds 3a–3d possessed high extracting abilities and extracting selectivity for tested cations. The complexation UV-Vis spectra for a series of anions indicated compounds 3a–3d exhibited the strong complexation abilities for tested anions. The ¹H-NMR titration study showed that compound 3d possessed excellent complexation abilities for ion-pair of NaH₂PO₄ in 1:1 host-guest complex with the association constant of 4.6 × 10⁴ M^?1.     

Synthesis of Schiff Base Calix [4] arene Crowns

This letter reports the synthesis of Schiff base calix [4] arene crowns containing m-xylylene phenol subunit, in which calix [4] arene Schiff base crowns 2a,2b and 2c were formed by 1:1 condensation of calix [4] arene diamine 1 with dialdehydes (2,6-diformyl-4-chlorophenol 3a,2,6-diformyl-4-methylphenol 3b,2,6-diformyl-4-tert-butylphenol 3c)under high dilute condition in refluxing anhydrous ethanol in 65-70% yield.     

Synthesis of Coumarin-functionalized Calix[4]arene and Selective Recognition for L-Tryptophan

We report a novel calixarene derivative using 4-bromomethyl-7-methoxycoumarin as the pre-organized unit and apply it to investigate selectively discriminate L-tryptophan from other amino acids in DMF-acetonitrile. 5, 11, 17, 23-Tetra-tert-butyl-25,27-bis-…     

Synthesis, Structure and Alkali Metal Ion Binding Properties of a Podand Polyether Derived from Calix[4]arene, 5,11,17,23-tetra-tert-butyl-25,27-di(phenylmethoxy)-26,28-di(2‘-methoxyethoxy)-calix[4]arene

The ligand 5,11,17,23-tetra-t-butyl-25,27-di(phenylmethoxy)-26,28-di(2-methoxy-ethoxy)calix[4]arene,designed as an analogue of some calixcrown speciesin order to evaluate possible origins of their selectivity in alkali metal ion binding, has been synthesised and structurally characterised by X-ray crystallography. The crystals are monoclinic, P21/n, a = 15.940(6), b = 19.388(5), c = 20.020(5) Å, = 109.10(2) deg., Z = 4, conventional R on |F| being 0.073 for 3454 independent, observed (I > 3(I)) reflections. 1H-NMR studies in 1:1 CD3CN/CDCl3solvent have shown that the ligand exerts a strong preference for the lighteralkali metal ions (Li+ and Na+) contrary to the binding behaviour of knowncalixcrowns. This may reflect interactions restricted to the lower rim donor atoms without concomitant interaction with the calixarene -electrons, perhaps because the latter interactions are substituted by those with the benzyl group -electrons.     

Synthesis and Conformational Properties of Bis（calix [4] arene）

The bis(calix [4] arene)3 was synthesized in moderate yield by the reaction of p-tert-butylcalix [4] arene (1) with 1,4-bis(chloromethyl) benzene (2). The conformation of all alkylated product 4 was investigated by the variable-temperature ^1H-NMR.     

Synthesis of Calix[4]arene Derivatives with NLO Properties

The new chromophore compounds with NLO properties were prepared by Knoevenagel condensation from forrnyl or diformyl calix[4/arene and isophorone derivatives in the presence of piperidine and acetic acid, respectively. In these chromophore calix[4]arenes, the ring locked trienes were employed as the conjugation bridge and electron acceptor in D-π-A units. The NMR spectra demonstrated that they existed in a cone conformation and consequently non-conjugated D-π-A units could be oriented at nearly the same direction.     

Calix [ 4 ] arene Polyaza Derivatives： Novel Effective Neutral Receptors for Cations and α-Amino Acids

IntroductionCalixarenes are one of the most important supra-molecular building blocks, which can be modified byintroducing different functional and/or structural groupsto create a specific interaction between the host and thetarget molecules, such as meta…     

A Comparative Study of Complexation of β-Cyclodextrin,Calix[4]arenesulfonate and Cucurbit[7]uril with Dye Guests: Fluorescence Behavior and Binding Ability

The complexation behaviors of acridine red (AR), neutral red (NR) and rhodamine B (RhB) dye guest molecules by three kinds of supramolecular hosts, including β-cyclodextrin (β-CD), calix[4]arene tetrasulfonate (C4AS) and cucurbit[7]uril (CB[7]), have been investigated by means of fluorescence spectra in aqueous citrate buffer solution (pH 6.0). The results obtained show that the three hosts, possessing different types of cavity, lead to various complexation-induced fluorescence of dye guests, and present different binding ability and molecular selectivity. The complexation stability constants decrease in the order of NR > AR > RhB for C4AS and CB[7] hosts, while in the order of RhB > AR > NR for β-CD host. Particularly, CB[7] displays the strongest binding ability with NR (K _S = 33300 M^? 1), and provides the molecular selectivity of 4.8 for NR/AR pairs. Although the binding ability of C4AS for present dye guests is weaker than CB[7], but the molecular selectivity of the two hosts are nearly equivalent. β-CD shows stronger binding ability with RhB (K _S = 5880 M^? 1) as comparison with CB[7] and C4AS. Furthermore, the solvent effects and salt effects during the course of complexation have also been investigated.     

Study on the Inclusion Complex of C_(60) and Calix[8]arene Tetraphenyl Ether

Fullerenehasgeneratedarapidlygrowingandactiveresearchareal.InclusioncomplexesoffullerenehavebeenpreparedforCoowithavarietyofhostsystemsincludingcalixarenes,cyclotriveratrylene,andy-cyclodextrin.TheselectiveformationofaclathratefromCooandcall-c[8]areneswasexcellentlyutilizedfortheseparationofCooandC,,'.HereinwereportthatCoocanbeincludedinthecavityofanewkindoffunctionnedcalixlslarene,p-tert-butylcall-c[8]arenetetraphenylether(1).ThefixtureofCooand1(lfZmolarratio)wasrefluxedintoluenefor2--3h,d…     

Erratum to: “Asymmetric Calix[4]-thiacalix[4]arene Tubes: Synthesis and Ionophore Properties”

Russian Journal of Organic Chemistry -     

Design and Syntheses of Novel Calix[4]crown: Calix[4]‐Dixanthates‐Crowns

Abstract

A series of novel calix[4]‐dixanthates‐crowns were designed and synthesized by the “1 + 1 condensation” of reacting calix[4]‐1,3‐dixanthate salts derivative (4) with polyethylene glycol ditosylates in 40–60% yields. It was found that the new calixcrowns showed outstanding complexation abilities towards soft cations. Calix[4]‐dixanthate‐crown‐4 (5b) exhibited high complexation selectivity towards Ni²⁺.     

Syntheses of Chiral Calix [4] arene Derivatives Bearing Amino Acid Residue

The syntheses of chirai calix[4]arene derivatives bearing amino acid residue at the lower rim or upper rim by three different methods were reported.     

Studies on Properties of p—Nitrophenylazo Calix[4]arene Derivatives

The p-nitrophenylazo calix[4] arene derivatives la-ld with nonlinear optical(NLO)properties were prepared by the diazo-coupling reaction of calix[4]arene with p-nitrophenyl diazonium.The diazotization reaction of p-nltroaniline was caried out with isoamyl nitrite as a source of nitrous acid in EtONa/EtOH under refluxing conditon.X-Ray crystallographic analysis and ^1H NMR sptectra reveal that they exist as cone conformation in crystal state or in soution.HRS measurements at 1064 nm in THF indicate that p-nitrophenylazo calix[4]arenes have higher hyperpolarizability βz values than the corresponding reference compound 4-(4-nitrophenylazo)-2,6-dimethyl-phenol,without red shift of the charge transfer band.The tetrakis p-nitropheylazo calix[4]arene(2)with longer alkyl chains can form monolayer aht the air/water interface.     

Synthesis,Complexation and Photophysics in Protic Solvents of Lanthanide Complexes of Novel Calix[4]arene Polycarboxylic-2,2′-bipyridine Mixed Ligands

Two novel cone calix[4]arene ligands 11a and 11b bearing two iminodiacetic chelating units and two C 6 or C 5 substituted 2,2'-bipyridine chromophores in diametral position at the lower rim were synthesized. These ligands form complexes with lanthanide ions in methanol solution whose stability (4.5<log K ass <6.2) depends on the substitution pattern (C 6 or C 5 ) of the 2,2'-bipyridine units. Contrary to that observed with other neutral calixarene ligands, the luminescence properties of the Eu 3+ and Tb 3+ complexes are not very much affected by the type of the 2,2'-bipyridine chromophore. Luminescence lifetimes (0.31 ms< <1.1 ms) and quantum yields (0.017< { <0.130) are higher for Terbium compared with the corresponding Europium complexes.     

Selective Electrochemical Recognition of o-Phenylenediol by a Novel Calix[4]arene Derivative

A new type of calixarene-modified electrode has been prepared by directly coating the surface of a glassy carbon electrode with tetrahydrofuran solution containing 25,26,27,28-tetra-（3-amidino thiopropoxy）-5,11,17,23-tetratert-butylcalix[4]arene, and applied to the investigation of electrochemical behavior of phenylenediols. The results showed that the modified electrode could selectively recognize o-phenylenediol, making the over-potential of o-phenylenediol dropped and peak current increased greatly. The anodic peak current is proportional to the concentration of o-phenylenediol in the range of 1.0×10^-5-1.0×10^-4 mol·L^-1 with the detection limit （SIN=3） of 1.0×10^-7 mol·L^-1. The recognizing mechanism, including electrochemical process and binging sites, was also discussed using voltammetry.     

Host-guest assembly of pyridinium-conjugated calix[4]arene via cation-π interaction

25-(4-Pyridiniumbutoxy)-26,27,28-trihydroxycalix[4]arene bromide 1 was designed to have both host and guest units in one molecule, and was assembled to become an oligomer via a cation-π interaction. X-ray diffraction (XRD) crystallographic study of 1 revealed that it oriented in a one-dimensional structure. Titrimetric ¹H NMR analysis and electrospray ionization mass spectrometry (ESI-MS) analysis indicated that 1 formed an oligomer in solution, and the restraint of the segmental motion would lead to the stabilization of the cation-π interaction compared with a bi-molecular complex composed of 25,26,27,28-tetrahydroxycalix[4]arene and N-butylpyridinium bromide.     

Synthesis and Crystal Structure of a Novel Calix [8] arene Ester Derivative

The synthesis and crystal structure of a novel calix[8] arene ester are reported herein. The calix [8] arene ester derivative has been characterized by IR,NMR and X-ray crystal analysis. The X-ray structure analysis revealed that the 8 phenolic hydroxy groups of the calix [8] arene have been substituted by 4 diethyl dibromomalonate molecules with each two adjacent hydroxy oxygen atoms attached to a bridge diethyl malonate.     

Interaction and Interfacial Molecular Recognition of Calix[4] arene Derivatives Bearing Nucleobases for Complementary Nucleoside

The p-tert-butyl calix[4] arene derivatives la with uracils and 1b with adenines at the lower rim were synthesized.The Interaction between 1a and 1b in CDCl3 solution was demonstrated by ^1H NMR spectra.The interfacial molecular recognitions of la and 1b for the complementary nucleosides in aqueous subphases were investigated by Langmuir-Blodgett technique.     

Synthesis of Calix[4]arene with ω-Chloroalkyl Groups at the Lower Rim

杯［４］芳烃以Ｃｌ（ＣＨ２ＣＨ２Ｏ）ｎＴｓ（ｎ＝１，２）烷基化。得到６５～８７％的下缘带有２－氯乙氧基和２－（２－氯乙氧基）乙氧基杯［４］芳烃。