Fluorescent Brightener OB-1

• CAS: 1533-45-5
• Catalog Number: ACM1533455-2
• Category: Main Products
• Molecular Weight: 414.5g/mol
• Molecular Formula: C28H18N2O2
• Description: DryPowder
• Synonyms: 2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole
• IUPAC Name: 2-[4-[(E)-2-[4-(1,3-benzoxazol-2-yl)phenyl]ethenyl]phenyl]-1,3-benzoxazole
• SMILES: C1=CC=C2C(=C1)N=C(O2)C3=CC=C(C=C3)C=CC4=CC=C(C=C4)C5=NC6=CC=CC=C6O5
• InChI: InChI=1S/C28H18N2O2/c1-3-7-25-23(5-1)29-27(31-25)21-15-11-19(12-16-21)9-10-20-13-17-22(18-14-20)28-30-24-6-2-4-8-26(24)32-28/h1-18H/b10-9+
• InChI Key: ORACIQIJMCYPHQ-MDZDMXLPSA-N
• Appearance: Yellow-Green or Light Green powder
• Complexity: 583
• Covalently-Bonded Unit Count: 1
• EC Number: 216-245-3
• Exact Mass: 414.136828g/mol
• Formal Charge: 0
• H-Bond Acceptor: 4
• H-Bond Donor: 0
• Heavy Atom Count: 32
• Monoisotopic Mass: 414.136828g/mol
• NSC Number: 252132
• Rotatable Bond Count: 4
• UNII: 128BY3ERD5
• XLogP3: 7.2

Case Study

Fluorescent Brightener OB-1 Used for Green Whitening of Polyester Fabrics

Cai, Yingjie, et al. Heliyon, 2024, 10(17), e36926.

In order to meet the challenge of applying fluorescent brightener OB-1 to PET fabrics by exhaust dyeing method, this work uses raw OB-1 powder in water and decamethylcyclopentasiloxane (D5) medium to effectively enhance the white polyester fabric without causing significant changes to the structure of the PET fabric. Temperature and water:D5 ratio during the whitening process significantly affected the whiteness of polyester fabrics (P < 0.05) with contribution percentages of 74.2 % and 25.2 % respectively.
Whitening process with fluorescent brightener OB-1
· The weight percentage of OB-1, ranging from 0.0025% to 0.0375% based on the weight of the fabric (o.w.f), was added to a blended medium of water and D5. The water-to-D5 ratio in this mixture varied from 0:100 to 10:90 (by volume) to create the whitening solution.
· The PET knitted fabric was then immersed in this whitening solution with a liquor-to-mass ratio (LR) of 25:1. The whitening treatment was performed in an infrared heating dyeing machine (HB-HW × 24). The temperature was gradually raised from 30 °C to the target range of 90-130 °C at a rate of 1 °C/min and maintained at that temperature for a specified duration. Subsequently, the temperature was rapidly decreased back to 30 °C at a rate of 5 °C/min. The whitened PET fabric was then squeezed and washed in pure ethanol at 30 °C for 2 minutes in the dyeing machine to remove any adsorbed D5 medium. This was followed by a soaping process in a solution containing 2 g/L of non-ionic detergent with an LR of 50:1 at 95 °C for 15 minutes in the dyeing machine. Finally, the soaped fabric was dried in an oven at 90 °C.

Optical Brightener OB-1 Nanoparticles Treat the Whiteness of Polyester Fabrics

Cai, Yingjie, et al. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2023, 676, 132320.

A new approach, using a fluorescent whitening compound, OB-1 nanopowder (OB-1-G), and a dispersant, was developed to whiten polyester fabric. Taguchi treatment was performed to optimize whitening process parameters and whitening treatment temperature has significant impact on the whiteness of polyester fabrics (P < 0.05) with contribution rate of 93.87%. The whiteness index of polyester fabric treated under optimized conditions is 94.12.
OB-1-G polyester fabric whitening process
A nano-colloidal dispersion of OB-1-G containing 0.02% to 0.10% solids o.m.f (depending on the material mass) was applied to bleach PET fabric. The treatment temperature varied from 90 to 130 °C, and the duration at the target temperature ranged from 0 to 70 minutes, with a liquor-to-goods ratio between 10:1 and 90:1 to assess the whitening effectiveness. The whitening process was conducted using an infrared dyeing machine. Following the whitening treatment, the sample was immersed in a soap solution (2 g/L of Luton 500, with a liquor ratio of 50:1) at 95 °C for 15 minutes to eliminate any surface-bound OB-1-G nanoparticles. Finally, the sample was dried in an oven at 90 °C.

Custom Q&A

What is the molecular formula of Fluorescent Brightener OB-1?

The molecular formula of Fluorescent Brightener OB-1 is C28H18N2O2.

What is the molecular weight of Fluorescent Brightener OB-1?

The molecular weight of Fluorescent Brightener OB-1 is 414.5 g/mol.

What is the IUPAC name of Fluorescent Brightener OB-1?

The IUPAC name of Fluorescent Brightener OB-1 is 2-[4-[(E)-2-[4-(1,3-benzoxazol-2-yl)phenyl]ethenyl]phenyl]-1,3-benzoxazole.

What is the InChI of Fluorescent Brightener OB-1?

The InChI of Fluorescent Brightener OB-1 is InChI=1S/C28H18N2O2/c1-3-7-25-23(5-1)29-27(31-25)21-15-11-19(12-16-21)9-10-20-13-17-22(18-14-20)28-30-24-6-2-4-8-26(24)32-28/h1-18H/b10-9+.

What are the synonyms of Fluorescent Brightener OB-1?

The synonyms of Fluorescent Brightener OB-1 are 1533-45-5, 4,4'-Bis(2-benzoxazolyl)stilbene, 2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole, and 1,2-Bis(4-(benzo[d]oxazol-2-yl)phenyl)ethene.

What is the CAS number of Fluorescent Brightener OB-1?

The CAS number of Fluorescent Brightener OB-1 is 1533-45-5.

What is the XLogP3-AA value of Fluorescent Brightener OB-1?

The XLogP3-AA value of Fluorescent Brightener OB-1 is 7.2.

How many hydrogen bond acceptors are there in Fluorescent Brightener OB-1?

There are 4 hydrogen bond acceptors in Fluorescent Brightener OB-1.

What is the topological polar surface area of Fluorescent Brightener OB-1?

The topological polar surface area of Fluorescent Brightener OB-1 is 52.1Ų.

How many rotatable bond counts are there in Fluorescent Brightener OB-1?

The number of rotatable bond counts in Fluorescent Brightener OB-1 is not provided in the reference.