99663-97-5

Upstream product

• 43141-69-1 3-(N,N-dibutylamino)phenol 
• 2892-51-5 squaric acid 
• 613-29-6 N-Dibutylaniline 

Downstream Products

• 230306-78-2 2,4-bis<4-(dibutylamino)phenyl>squaraine 

Relevant academic research and scientific papers

A regenerative chemodosimeter based on metal-induced dye formation for the highly selective and sensitive optical determination of Hg2+ ions

(Chemical Equation Presented) Into the blue: Hg2+-ion-triggered formation of a brightly fluorescent squaraine dye is used as a novel approach for the design of highly selective and sensitive chromofluorogenic probes for the analysis of Hg2

2,4-Bis[4-(N,N-dibutylamino)phenyl]squaraine: X-ray crystal structure of a centrosymmetric dye and the second-order non-linear optical properties of its non-centrosymmetric Langmuir-Blodgett films

Crystals of the title compound exist as a green monoclinic phase [space group P21/c with a=9.046(1), b=19.615(2), c=9.055(1) A, β=116.107(5)°, Z=2] and a purple triclinic phase. The chromophore is both planar and centrosymmetric and its dimensi

COLORED CURABLE RESIN COMPOSITION

The present invention provides a colored curable resin composition comprising: one or more kinds of colorants (A1) selected from the group of C.I. pigment yellow 138, a green pigment and a yellow pigment, Squarylium dye (A2), resin (B), polymer compounds

Thermotropic behaviour, self-assembly and photophysical properties of a series of squaraines

A series of squaraine dyes, based on 2,4-bis[4-(N,N-di-n-alkylamino)-2- hydroxyphenyl] squaraine including ethyl, propyl, butyl, pentyl, hexyl and heptyl derivatives, were synthesised by condensation of the corresponding 4-(N,N-di-n-alkylamino)-2-hydroxyp

Isomeric squaraine-based [2]pseudorotaxanes and [2]rotaxanes: Synthesis, optical properties, and their tubular structures in the solid state

On the basis of formation of [2]pseudorotaxane complexes between triptycene-derived tetralactam macrocycles la and lb and squaraine dyes, construction of squaraine-based [2]rotaxanes through clipping reactions were studied in detail. As a result, when two symmetrical squaraines 2d and 2e were utilized as templates, two pairs of isomeric [2]rotaxanes 3a-b and 4a-b as diastereomers were obtained, owing to the two possible linking modes of triptycene derivatives. It was also found, interestingly, that when a nonsymmetrical dye 2 g was involved, there existed simultaneously three isomers of [2]rotaxanes in one reaction due to the different directions of the guest threading. The 1H NMR and 2D NOESY NMR spectra were used to distinguish the isomers, and the yield of [2]rotaxane 5 a with the benzyl group in the wider rim of the host la was found to be higher than that of another isomer 5 b with an opposite direction of the guest, which indicated the partial selection of the threading direction. The X-ray structures of 3 b and 4 a showed that, except for the standard hydrogen bonds between the amide protons of the hosts and the carbonyl oxygen atoms of the guests, multiple Ji-Ji stacking and C-H-ji interactions between triptycene subunits and aromatic rings of the guests also participated in the complexation. Crystallographic studies also revealed that the [2]rotaxane molecules 3 b and 4 a further self-assembled into tubular structures in the solid state with the squaraine dyes inside the channels. In the case of 4 a, all the nonsymmetrical macrocyclic molecules pointed in one direction, which suggests the formation of oriented tubular structures. Moreover, it was also found that the squaraines encapsulated in the triptycenederived macrocycles were protected from chemical attack, and subsequently have potential applications in imaging probes and other biomedical areas.

A colorimetric chemodosimeter for Pd(II): a method for detecting residual palladium in cross-coupling reactions

A colorimetric chemodosimeter (SQ1) for the detection of trace palladium salts in cross-coupling reactions mediated by palladium is described. Decolorization of SQ1 is affected by nucleophilic attack of ethanethiol in basic DMSO solutions. Thiol addition is determined to have an equilibrium constant (Keq) of 2.9×106 M-1, with a large entropic and modest enthalpic driving force. This unusual result is attributed to solvent effects arising from a strong coordinative interaction between DMSO and the parent squaraine. Palladium detection is achieved through thiol scavenging from the SQ1-ethanethiol complex leading to a color 'turn-on' of the parent squaraine. It was found that untreated samples obtained directly from Suzuki couplings showed no response to the assay. However, treatment of the samples with aqueous nitric acid generates a uniform Pd(NO3)2 species, which gives an appropriate response. 'Naked-eye' detection of Pd(NO3)2 was estimated to be as low as 0.5 ppm in solution and instrument-based detection was tested as low as 100 ppb. The average error over the working range of the assay was determined to be 7%.

Squaraine chemistry. On the anomalous mass spectra of bis(4-dimethylaminophenyl)squaraine and its derivatives

The electron inpact (EI) mass spectra of bis(4-dimethylaminophenyl)squaraine 1 and its derivatives 2-14 have been studied.Ions of mass number higher than the molecular ion, wich are shown to be precursors of fragment ions of lower mass numbers, are observed.From the structure-property relationship, these ions are assigned to M + CHR and M + H2 , were CH2R is the alkyl group in the N,N-dialkylanilino moiety of squaraine.Evidence is provided that the formation of M + CHR and M + H2 is the result of alkyl transfer and H transfer reactions within a squaraine aggregate rather than intermolecular vapor phase reeactions in the massspectrometer.This molecular aggregate is later shown to be a trimer by analysis of metastable ion data and chemical ionization mass spectrometry.The fragmentation sequence of this trimeric species is elucidated with the assistance of metastable ions.Results show that the trimer may break down to monomeric and dimeric species upon electron impact; alternatively,the four-membered ring of the central squaraine in the trimer may cleave to generate two species of approximately equal mass number.These two species usually dominate the mass spectrum and further fragment into M + CHR and M + H2.Detailed fragmentation schemes for M + CHR and M + H2 are proposed and discussed.