Treatment of H W ~( C O ) ~( T H F ) Z ( N O ) with PtBu3 gives HW2(CO)s(PtBu3)(NO) (l), [HP'PBus] [HW2(CO)1,] (2), and [HPtPBus] [(p-H)2W3(CO)l3(NO)] (3). Theanion (p-H)2W,(CO)l,(NO)-(3-) could bemoreconveniently prepared and isolated as [PPN] [ ( ~-H ) ~W ~( C O ) I ~( N O ) ] (4) from the reaction of HWz(CO)g(NO) with [PPNI-[HW(CO)s] (PPN+ = (Ph3P)2N+). Complex 3 reacts with a nucleophile L to form [HPtBu3] [ ( ~-H ) ~W ~( C O ) I ~-(L)(NO)] (5, L = PMe3; 6, L = PPh3; 7, L = P(OEt),; 8, L = M e N C ) . Crystal data for 5: C27H37N013P2W3; Cc (monoclinic); a = 19.275(5), b = 31.730(4), c = 12.948(2) A; 0 = 91.22(2)'; Z = 8; R = 0.030, R, = 0.030.Polynuclear metal complexes with solely M-H-M linkages among metal atoms are very scarce.6 Although an unsupported M-H-M linkage is fairly common for dimeric group VI metal carbonyl^,^ to our knowledge, (pL-H)2W3(CO)1,(NO)-is the first tungsten trimer which contains only unsupported M-H-M linkages. In this paper we describe thesynthesisand the reactivity of this unusual tungsten trimer. Experimental SectionGeneral Procedures. All reactions and manipulations were carried out under N2 with use of standard inert-atmosphere and Schlenk techniques. Solvents were dried by standard procedures. All column chromatography was performed with use of silica gel (23C-400 mesh B u ~.

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A bright blue emission material, bis {(benzimidazol-2-yl) Pyridenato} magnesium (MgBIP) used for organic light emitting devices, has been synthesized. The decomposition temperature was observed at 517 °C and no melting transition (Tm) of MgBIP was observed up to 400 °C. For three-layer LED devices with the configuration of ITO/NPB/MgBIP/ Alq3/MgAg, the white light emission covering the whole visible region from 400 to 750 nm with the maximum brightness of 2770 cd/m2and current density of 304 mA/cm2was observed.

An emission material, bis{2-(naphtha [3,4]imidazol-2-yl) pyridinato} Magnesium (MgNIP) used for organic light emitting devices, has been synthesized. The decomposition temperature was observed at 510°C and no melting transition (Tm) of MgNIP was observed up to 400°C. The emission spectrum of organic emitting device using MgNIP as emitted layer exhibits a broad maximum at 531 nm. The color of the emitted light is in the orange region in the CIE coordinate of x = 0.46 y = 0.46.