The hybrid ligand 3-(2,2'-bipyridine-6-ylmethyl)-1-mesityl-1H-imidazolylidene (NHC ) featuring both carbene and N-donor sites, was selectively complexed with various d metal cations in order to examine its coordination behavior with regard to homo and heterometallic structures. Respective silver complexes can be obtained by the silver oxide route and are suitable transmetallation reagents for the synthesis of gold(I) compounds. Starting from the mononuclear complexes [(NHC )AuCl], [(NHC )Au(C F )] and [(NHC ) Au][ClO ], open-chain as well as cyclic heterobimetallic complexes containing Cu , Ag , Zn , Cd , and Hg were synthesized. Furthermore, the homobimetallic species [(NHC ) M ][ClO ] (M=Cu, Ag) were obtained. All bimetallic compounds were fully characterized including single-crystal X-ray analysis. Their photoluminescence (PL) properties were investigated in the solid state at temperatures between 15 and 295 K and compared with those of the mononuclear species. There is a clear difference in PL properties between the open chain and the cyclic heterobimetallic complexes. The latter species show different PL properties, depending on the metals involved. In addition, collision-induced dissociation (CID) experiments were performed on electrosprayed cations of the cyclic heterobimetallic compounds, to compare the metal binding at the carbene and N-donor sites.

The triphenylmethane and all-meta tert-butyl triphenylmethane dimers, (TPM) 2 and (T t BuPM) 2 , respectively, were studied with ionization loss stimulated Raman spectroscopy in molecular beam experiments to resolve structure sensitive vibrations. This answers the question whether the recently reported linear head-to-head arrangement in (T t BuPM) 2 results from crystal packing or prevails also in the gas phase, and therefore must result from extraordinarily strong London dispersion (LD) interactions. Our study clearly demonstrates that the head-to-head arrangement is maintained even under isolated molecular beam conditions in the absence of crystal packing effects. The central Raman-active aliphatic CÀD vibration of appropriately deuterated (T t BuPM) 2 associated with an unusually short CÀD•••DÀC distance exhibits a strong blue-shift compared to the undisturbed case. As the LD stabilizing tert-butyl groups are absent in (TPM) 2 , it displays an approximately S 6 -symmetric tail-to-tail arrangement.

Triphenylmethan und seine (substituierten) all-metatert-Butyl-Triphenylmethan-Dimere, (TPM) 2 und (T t BuPM) 2 , wurden mit stimulierter Raman-Spektroskopie in Molekularstrahlexperimenten (Ionization loss stimulated Raman spectroscopy, ILSRS) untersucht, um struktursensitive Schwingungen zu analysieren. Damit konnte die Frage beantwortet werden, ob die kürzlich beschriebene lineare Kopf-an-Kopf-Anordnung in (T t BuPM) 2 aufgrund von Kristallpackungseffekten resultiert oder auch in der Gasphase vorherrscht und folglich durch außerordentlich starke London-Dispersionswechselwirkungen (LD) bedingt ist. Unsere Studie belegt eindeutig, dass die Kopf-an-Kopf-Anordnung auch unter isolierten Molekularstrahlbedingungen ohne Kristallpackungseffekte beobachtet wird. Bei entsprechend deuteriertem (T t BuPM) 2 , welches in der hier zugeordneten Struktur einen ungewçhnlich kurzen C-D•••D-C-Abstand aufweist, zeigt die zentrale Raman-aktive aliphatische C-D-Streckschwingung eine charakteristische Blauverschiebung im Vergleich zu anderen Dimeranordnungen. Da im Fall von (TPM) 2 die LD-stabilisierenden tert-Butylgruppen fehlen, zeigt es eine annähernd S 6symmetrische Rücken-an-Rücken-Anordnung.

Chromone offers two energetically almost equivalent docking sites for alcohol molecules, in which the hydroxyl group is hydrogen bonded to one of the free electron pairs of the carbonyl O...

A hybrid ligand featuring both carbene and N‐donor sites, was selectively complexed with various d10 metal cations. Open‐chain and cyclic bimetallic complexes were selectively obtained independently of the metals and the reactions conditions. The photoluminescence of all open‐chain bimetallic complexes is quite similar. In contrast, the cyclic bimetallic compounds feature different photoluminescence properties, depending on the metals involved. The cover picture shows both open‐chain and cyclic bimetallic complexes and indicates their difference in photoluminescence. More information can be found in the Full Paper by P. W. Roesky, et al. on page 6094.