Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn’t involve a screen. 19845-69-3, C30H32P2. A document type is Article, introducing its new discovery., Formula: C30H32P2
Preparation, characterization, and luminescence properties of a 58-electron linear Pt4 cluster, [Pt4(dmb)4(PPh3)2]2+ (dmb = 1,8-diisocyano-p-menthane), and its diphosphine polymers
The title compounds [Pt4(dmb)4(PPh3)2]Cl2 (1) and {[Pt4(dmb)4(diphos)]Cl2}n (diphos = dppb (2), dppp (3), dpph (4)) have been prepared in good yields from the reaction of Pt2(dba)3·CHCl3 with 2 equiv of dmb and 1 equiv of PPh3 for 1 (dba = dibenzylideneacetone) and from the reactions of Pt2(dba)3·CHCl3 with 2 equiv of dmb and 0.5 equiv of diphos for 2-4. The structure for 1 consists of a quasi-linear Pt4L22+ species (L = PPh3; d(PtPt) = 2.666(2), 2.655(2), 2.641(2) A), where the dmb ligands bridge the Pt atoms forming a catenate. From Raman spectroscopy, the two v(PtPt) active modes for 1 are observed at 162 and 84 cm-1 (F(PtPt) = 2.36 mdyn A-1). For 2-4, the diphos ligands induce the formation of amorphous polymeric materials (X-ray powder diffraction patterns) with MW ranging from 84 000 to 307 000 according to viscometry. EHMO calculations predict that the HOMO and LUMO are the two dsigma* orbitals arising from four interacting Pt atoms via the dx2-y2, dz2, s, and px M atomic orbitals. These are mixed with the ddelta and CNR(pi*) MO’s. From the examination of the position, absorptivity, and fwhm (full width at half maximum) of the strongly allowed low-energy UV-vis band, a dsigma* ? dsigma* assignment is made (lambdamax = 405 nm, ? = 35 800 M-1 cm-1; EtOH for 1). The four compounds are luminescent at 77 K in EtOH, where lambdaemi are 750, 736, 750, and 755 nm and taue are 2.71, 4.78, 5.15, and 5.17 ns for 1-4, respectively. On the basis of the Stokes shifts (10 000-12 000 cm-1) and the long emission lifetimes, a phosphorescence dsigma* ? dsigma* assignment is made for the observed emissions. Crystal data for 1: crystal system triclinic; space group P1; a = 12.624(4) A;b = 14.24(2) A; c = 27.312(3) A; alpha = 92.35(3); beta= 91.655(15); gamma = 90.28(5); V = 4903(7) A3; Z = 2; Dcalc = 1.528 g cm-3; R1 = 0.0738; wR2 = 0.2097; S = 1.018.
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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate