The laser-induced fluorescence spectra of jet-cooled benzo-18-crown-6 (B18C6) and dibenzo-18-crown-6 (DB18C6) exhibit a number of vibronic bands in the 35 000-37 000 cm(-1) region. We attribute these bands to monomers and hydrated clusters by fluorescence-detected IR-UV and UV-UV double resonance spectroscopy. We found four and two conformers for bare B18C6 and DB18C6, and the hydration of one ...

INTRODUCTION Dibenzo(a,h)anthnacene and the three metabolically pos sible trans-dihydrodiols of dibenzo(a,h)anthracene were tested for tumorigenic activity on mouse skin and in new born mice. in the tumorigenicity study on mouse skin, a single topical application of 10 to 160 nmol of compound was followed 7 days later by twice-weekly applications of the tumor promoter 12-O-tetradecanoylphorbol-...

The title compound, C(38)H(30)OP(2)S·CH(2)Cl(2), belongs to the xanthene family of ligands containing S- and O-donor atoms in the central heterocylic ring. Positions 2 and 8 on the xanthene backbone are functionalized with methyl groups to allow for the selective functionalization of the backbone at positions 4 and 6 with diphenyl-phosphanyl units. The title compound shows a significant 'roof-l...

In the title compound, C(25)H(29)NO(6), each of the cyclo-hexenone rings adopts a half-chair conformation. Each of the pairs of hy-droxy and carbonyl O atoms are oriented to allow for the formation of intra-molecular O-H⋯O hydrogen bonds, which are typical of xanthene derivatives. The nitro group is rotationally disordered over two orientations in a 0.544 (6):0.456 (6) ratio. In the crystal, we...

Grafting and stabilization of metal complexes for increasing catalytic activity have remained an enormous challenge in the arena. However, designing a system with complementary properties including high surface area, loading, easy separation offers promising route efficient utilization magnetic material various applications. Herein, novel core–shell nanosphere catalyst (Fe3O4@C/KP23@MnCl2) was ...

introduction: the treatment of cutaneous leishmaniasis (cl) is based primarily on the use of pentavalent antimonials, which may lead to many side effects limiting their use. photodynamic therapy (pdt) is an alternative for the treatment of cl, and some xanthene dyes have the potential for use in pdt. methods: the xanthenes rose bengal b (rb) and its derivatives rose bengal methyl ester (rbmet),...

a green and convenient méthode for the synthesis of  a variety of xanthene derivatives by condensation reaction between aldehydes and β-naphthol or dimedone in an micellar solution of sodium dodecylphosphonate is described. this method offers several advantages, such as using of a cheap and environmentally benign reaction media, low loadings of sodium dodecylphosphonate as catalyst and easy wor...

Artičoka (Cynara scolymus L.) je višegodišnja biljna vrsta koja zahvaljujući svojim prehrambenim ali i zdravstvenim značajkama postaje sve raširenija kultura na području primorske hrvatske otoka. Tijekom svog razvoja artičoka podložna napadu brojnih štetnika među kojima su gospodarski značajni nekoliko lisnih ušiju leptira. Lisne uši kao fiziološki štetnici sisanjem listova cvjetnih glavica pos...