The carbon dimer, the C2 molecule, is ubiquitous in astronomical environments. Experimental-quality rovibronic energy levels are reported for C2, based on rovibronic transitions measured for and among its singlet, triplet, and quintet electronic states, reported in 42 publications. The determination utilizes the Measured Active RotationalVibrational Energy Levels (MARVEL) technique. The 23,343 ...

We introduce a broadly applicable technique to create nuclear spin singlet states in organic molecules and other many-atom systems. We employ a novel pulse sequence to produce a spin-lock induced crossing (SLIC) of the spin singlet and triplet energy levels, which enables triplet-singlet polarization transfer and singlet-state preparation. We demonstrate the utility of the SLIC method by produc...

Singlet and triplet–triplet energy transfer in phosphorescent dye doped polymer light emitting devices were investigated. Poly(N-vinylcarbazol) and poly@9,98-di-n-hexyl-2,7-fluorene-alt1,4-(2,5-di-n-hexyloxy)phenylene] ~PFHP! were selected as the host polymer for the phosphorescent dopants fac-tris~2-phenylpyridine! iridium~III! @Ir(ppy)3# and 2,3,7,8,12,13, 17,18-octaethyl-21H,23H-porphyrin pl...

Three independent mol-ecules of the title estrone derivative and a mol-ecule of methanol comprise the asymmetric unit of the title compound [systematic name: 13-methyl-6,7,8,9,11,12,13,14,15,16-deca-hydro-cyclo-penta-[a]phenanthren-3-ol-meth-an-ol (3/1)], 3C(18)H(24)O·CH(3)OH. Two of the estrone mol-ecules exhibit 50:50 disorder (one displays whole-mol-ecule disorder and the other partial disor...

The particle-hole continuum (PHC) for massive Dirac fermions provides an unprecedented opportunity for the formation of two collective split-off states, one in the singlet and the other in the triplet (spin-1) channel, when the short-range interactions are added to the undoped system. Both states are close in energy and are separated from the continuum of free particle-hole excitations by an e...

A theoretical exploration about hydrogen bonding in a series of synthetic regioisomeric antitumor tricyclic hydroquinones is presented. The stabilization energy for the intramolecular hydrogen bond (IHB) formation in four structurally different situations were evaluated: (a) IHB between the proton of a phenolic hydroxyl group and an ortho-carbonyl group (forming a six-membered ring); (b) betwee...

The cross section for the pp → pn π + reaction has been measured at 492 MeV by using the large acceptance ANKE magnetic spectrometer placed at an internal target position of the storage ring COSY-Jülich. The produced proton and pion were detected in coincidence in a region close to the forward direction such that the excitation energy in the np system was below 3 MeV. This is the region of the ...

Herein, we report on the synthesis, characterization, and reactivity studies of first cyclic C 2 As -diradicaloid {(IPr)CAs} ( 6 ) (IPr = C{N(Dipp)CH} ; Dipp 2,6- i Pr H 3 ). Treatment (IPr)CH 1 with AsCl affords Lewis adduct {(IPr)CH }AsCl Compound undergoes stepwise dehydrochlorination to yield {(IPr)CH}AsCl {(IPr)CAsCl} 5a or [{(IPr)CAs} Cl]OTf 5b Reduction (or magnesium turnings gives as a ...

The mol-ecule of the title compound, C(23)H(34)O(6), is built up from three fused carbocycles, one five-membered, one six-membered and one seven-membered. The five-membered ring has an envelope conformation, whereas the six-membered ring has a perfect chair conformation and the seven-membered ring has a boat conformation. Intra-molecular C-H⋯O hydrogen bonds together with van der Waals inter-ac...