Interaction of neutral ruthenium(II) complexes of the type RuHCl(CO)(PPh
3) (L-L′) where L-L′ = Ph
2
PCH
2
CH
2
PPh
2 (dppe),
1; Ph
2PCH
2CH
2CH
2PPh
2 (dppp),
2; Ph
2PCH
2CH
2AsPh
2 (arphos),
3 with ...AgClO
4 in the presence of L″ L″ = P(OMe)
3 or PME
3 yielded the new cationic ruthenium(II) complexes RuH(CO)(PPh
3)(L″)(L-L′)ClO
4 where L-L′ = dppe,
4; dppp,
5 arphos,
6; L″ = PMe
3,
4; P(OMe)
3,
5 and
6. All the complexes have been characterized by both analytical and spectroscopic (IR and
1H NMR) methods. The structure of a cationic complex
6, RuH(CO)(PPh
3)(P(OMe)
3) (arphos)ClO
4·n−C
5H
12, has been confirmed by single-crystal X-ray diffraction. The Ru atom is octahedrally coordinated with CO, PPh
3, and arphos in the equatorial plane and H and P(OMe)
3 in the axial positions. In the hydrogenation of cyclohexene, some relations between structures and catalytic activities have been studied. The cationic complexes have shown lower catalytic activities than their neutral analogues.
(±)-1,4-Di-
O-benzoyl-2,3-
O-isopropylidene-
myo-inositol (1) crystallises in the triclinic space group,
P1 with unit-cell dimensions
a = 10.432(2),
b = 11.595(4),
c = 12.654(2)
A
̊
,
α = 67.72(3),
β ...= 11.595(4),
γ = 12.654(2) degrees. (±)-1,4-
O-Dibenzoyl-5,6-
O-isopropylidene-
myo-inositol (2) crystallises in the monoclinic space group,
P2
1/n with unit-cell dimensions
a = 9.101(2),
b = 10.4900(9),
c = 22.806(4)
A
̊
,
α = 90,
β = 95.452(10),
γ = 90 degrees. The inositol ring of
cis-acetal 1 is flattened, whereas that of
trans-acetal 2 is more puckered compared to
myo-inositol. The acyl migration rates are discussed in terms of the crystalline conformations of 1 and 2.
Einfach durch Änderung des pH‐Werts kann der Einschluß und die Freisetzung kleiner organischer Moleküle in Cs+‐komplexiertem Cucurbituril gesteuert werden, wie unten schematisch für THF als ...Gastmolekül gezeigt.
A series of ruthenium(II) complexes RuH(CO)(NCCH
3)(PPh
3)
2(diphos)BF
4 (diphos: = dppm, Ph
2PCH
2PPh
2 (
2) ; dppe = Ph
2PCH
2CH
2PPh
2 (
3) ; = dppp, Ph
2PCH
2 CH
2CH
2PPh
2 (
4) ; = dppb, Ph
2PCH
...2CH
2CH
2CH
2PPh
2 (
5)) and RuH(CO)(NCCH
3) (PPh
3)(diphos)BF
4 (diphos : = dppe (
6) ; = dppp (
7) ; = dppb (
8) ; = dppf, Fe (η
5-C
5H
4PPh
2)
2 (
9)) was prepared from the reaction of RuH(CO)(NCCH
3)
2(PPh
3)
21 BF4 and diphos ligands by changing the reaction conditions. These complexes have been characterized by analytical and spectroscopic (IR and
1H NMR) methods. The structure of RuH(CO)(NCCH
3)(PPh
3)(dppf)BF
4 (
9) has been determined by X-ray crystallography. The homogeneous hydrogenations of propanal to propan-1-ol catalyzed by complexes
2–9 have been investigated at 90°C and 20 atm hydrogen pressure. The catalytic activities of the chelating diphosphine species
6–9 were dependent upon the structure of the complex as well as upon the ring sizes of the chelates.
Electrical characteristic of bottom-up synthesized silicon nanowire FETs is studied for possible pH sensing device applications. Dodecanethiol (DDT) molecules are used for the passivation of gold ...electrodes. This passivation changes the drain current level and the threshold voltage of the transistor, which could be due to the reaction of native oxide of the silicon surface with DDT molecules. The DDT passivation efficiently blocks the direct current through the electrolyte solution and the transistor is shown to respond to the change of pH.
We report electrical characteristics of back-gated silicon nanowire field effect transistors (SNWFETs) fabricated using silicon nanowires synthesized by a standard vapor-liquid-solid process. It is ...shown that the mobilities obtained from the measured transconductances are reasonable only when the nanowire is fully depleted.
The current status of synthesized semiconductor and metallic nanowires is still far from practical applications. However, in many cases, they serve as good technological precursors because their size ...and various physical properties are beyond what are obtainable from their lithographically patterned counterparts. Recently, aluminum nanowires (AlNWs) without grain boundaries and surface roughness were synthesized using a stress-induced growth technique. They exhibited ideal resistivity, high breakdown current density, and superb transmission at microwave frequencies, all of which provide clues for future very-large-scale integrated circuit (VLSIC) interconnects.
