Synthesis of hexanuclear molybdenum clusters containing phosphine oxide ligands

From Mesomorphic Phosphine Oxide to Clustomesogens Containing Molybdenum and Tungsten Octahedral Cluster Cores

“…This point is also in good accordance with the assumption that ligand L 2 and L 3 self-arranges in ad ouble-layer morphology.F or instance,bymolecular modeling of L 2 ,one arm of the star-shaped phosphine oxide ligand was found to measure in all-extended conformation around 37 w hereas the rough diameter of the molecule stands for approximately 55 . [15,23] Thee mission properties were investigated in the liquid crystalline state with samples deposited on glass slides,heated to isotropic state and then cooled down slowly to room temperature by using ap olarizing microscope equipped with ah otstage,a n irradiation source (irradiation in the 380-420 nm range), and aCCD spectrophotometer.Itwas found that title clustomesogens,exhibit broad emission ranged from 550 up to 900 nm, with approx. 5-42.8 ) are in fact slightly shorter than the one of corresponding ligand L 2 (45.3 ).…”

Red-NIR luminescence of Mo6 monolayered assembly directly anchored on Au(001)

“…9-11 M 6 octahedral transition metal atom clusters exhibit unique intrinsic structural and physical properties (photoluminescence, redox properties, generation of singlet oxygen) with an orthogonal disposition of metallic sites that can be selectively functionalized. [12][13][14][15] These make them relevant building blocks for the structuration at the nanometric scale and functionalization of hybrid organic-inorganic materials, supramolecular and hydrogen bonded frameworks, coordination compounds and functional surfaces. In particular, face-capped [Mo 6 X i 8 X a 6 ] 2− clusters, where X is a halogen, can be prepared by solid-state synthesis, 16 and then modified by exchanging the apical halogen X a by specific chemical functions designed to enhance the optical properties or to favor a better integration in organic materials (e.g.…”

Synthesis and electrochemical study of the first tetrazolate hexanuclear rhenium cluster complex

“…Our group has been interested in developing the fundamental chemistry of hexanuclear clusters even further by developing synthetic methodologies and investigating how the cluster core affects the reactivity of the coordinated ligands. 6 Towards this end, we tried to substitute the acetonitrile ligand on the sitedifferentiated cluster complex [Re 6 Se 8 (PEt 3 ) 5 (NCCH 3 )] 2+ with azide. Gray and Holm reported that these clusters are substitutionally inert (k = 10 25 -10 26 s 21 at 318 K); 7 therefore, we heated the original reaction mixture containing [Re 6 Se 8 (PEt 3 ) 5 -(NCCH 3 )] 2+ and N 3 2 at reflux to drive the reaction.…”