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41.
Pyridine-2-carbaldehyde thiosemicarbazones [C5H4N1-C(H)N2-N3H-C(S)-N4HR, R = H, L1H2; CH3, L2H2-Me; CH2CH3, L3H2-Et] with Ru(PPh3)3Cl2 have formed mononuclear RuII precursors for the generation of trinuclear complexes. The reaction of 2 mol each of L1H2, L2H2-Me, or L3H2-Et with Ru(PPh3)3Cl2 in the presence of Et3N has yielded mononuclear complexes [Ru(N3,S-L1H)2(PPh3)2] (1), [Ru(N3,S-L2H-Me)2(PPh3)2] (2), and [Ru(N3,S-L3H)2(PPh3)2] (3). The addition of 2 equiv of copperI chloride solution to complex 1 in acetonitrile has formed a novel trinuclear complex, (Ph3P)2RuII(L1)2CuII2Cl2 (4), in which the pendant amino group (-N4H2) loses one hydrogen along with the oxidation of CuI to CuII. In this complex, RuII is bonded to two P, two S, and two N3 atoms, while each CuII is coordinated to N1, N2, N4, and Cl atoms. Reaction with copper(I) bromide yielded a similar trinuclear complex, (Ph3P)2Ru(L1)2CuII2Br2 (5). From precursors 2 and 3, analogous complexes (Ph3P)2RuII(L2-Me)2CuII2Cl2 (6), (Ph3P)2RuII(L2-Me)2CuII2Br2 (7), (Ph3P)2RuII(L3-Et)2CuII2Cl2 (8), and (Ph3P)2RuII(L3-Et)2CuII2Br2 (9) have been synthesized. These complexes have been characterized using analytical, spectroscopic, and electrochemical techniques. Single-crystal X-ray crystallography has been carried out for precursor 2 and all of the trinuclear complexes, 4-9. X-band electron spin resonance and UV-vis spectra have confirmed the presence of CuII. The cyclic voltammetry studies support the RuII/RuIII redox behavior of this metal in trinuclear complexes. 相似文献
42.
Amplitude filters with non-linear adaptive performance in the Fourier plane of a mirror optical system are considered. Panchromatic silver bromide layers with a printout effect are employed. The processing of binary and grey-scale images with the aid of a passively adaptive mirror filtering block is investigated. 相似文献
43.
44.
MP Janawadkar R Baskaran R Nagendran K Gireesan N Harishkumar Rita Saha L S Vaidhyanathan J Jayapandian Y Hariharan TS Radhakrishnan 《Pramana》2002,58(5-6):1159-1164
A program has been developed and initiated at the Indira Gandhi Centre for Atomic Research (IGCAR) for the utilization of
SQUID sensors in various application areas. DC SQUID sensors based on Nb-AlO
x
-Nb Josephson junctions have been designed and developed inhouse along with associated flux-locked loop (FLL) electronics.
A compact low field SQUID magnetometer insertible in a liquid helium storage dewar has also been developed inhouse and is
in use. Efforts to build a high field SQUID magnetometer, SQUID-DAC system, are in progress. A planar gradiometric DC SQUID
sensor for non-destructive evaluation (NDE) application to be used in relatively unshielded environment has been designed
and developed. An easily portable NDE cryostat with a small lift-off distance, to be used in external locations has been designed
and tested. The magnetic field produced by a given two-dimensional current density distribution is inverted using the Fourier
transform technique. 相似文献
45.
Lobana TS Kumari P Sharma R Castineiras A Butcher RJ Akitsu T Aritake Y 《Dalton transactions (Cambridge, England : 2003)》2011,40(13):3219-3228
The influence of substituents at the C(2) carbon of N(1)-substituted thiosemicarbazones, {C(4)H(3)X-C(2)(CH(3))=N(3)-N(2)H-C(1)(=S)N(1)HR(2)} (X = O, S) on the geometry of nickel(ii) complexes has been investigated. The presence of a methyl group at the C(2) position of 2-acetylfuran-N(1)-substituted thiosemicarbazones {(C(4)H(3)O)-C(2)(CH(3))=N(3)-N(2)H-C(1)(=S)N(1)HR(2), R(2) = CH(3), HaftscN-Me; C(2)H(5), HaftscN-Et; C(6)H(5), HaftscN-Ph} induces unusual coordination by the furan ring and yielded high spin octahedral nickel(II) complexes, [Ni(κ(3)-O, N(3), S-aftscN-R(2))(2)], CH(3)1, C(2)H(5)2, and 2[Ni((κ(3)-O, N(3), S-aftscN-Ph)(2)] 3 (μ(eff) = 2.98, 1; 2.96, 2; 2.92, 3). With 2-acetylthiophene-N(1)-substituted thiosemicarbazones, {(C(4)H(3)S)-C(2)(CH(3))=N(3)-N(2)H-C(1)(=S)N(1)HR(2), R(2) = CH(3), HattscN-Me; C(2)H(5), HattscN-Et; C(6)H(5), HattscN-Ph}, N(3), S chelated low spin trans square planar complexes, {[Ni(κ(3)-O, N(3), S-attscN-R(2))(2)], R(2) = CH(3), 4; C(2)H(5), 5; C(6)H(5), 6} with pendant thiophene rings have been obtained. The bigger sized sulfur atoms of the thiophene rings form short intramolecular contacts with the deprotonated hydrazinic nitrogen atoms (SN(2)) inhibiting its lability for possible coordination to nickel(II). Complexes have one independent molecule (1) or two independent molecules (2, 3) in their respective crystal lattices. The simultaneous presence of methyl groups at the C(2) and N(1) atoms of 2-acetylthiophene-N(1)-methylthiosemicarbazone (HattscN-Me) have facilitated the binding of triphenylphosphine in three-coordinate copper(i) halide complexes, [CuX(η(1)-S-HattscN-Me)(Ph(3)P)] (X, Br, 7; Cl, 8), which represent an unusual donor set of ligands, namely, triphenylphosphine, sulfur of a thio-ligand and a halide. 相似文献
46.
47.
Reaction of RuCl2(PPh3)3 with N‐Phenyl‐pyridine‐2‐carbaldehyde thiosemicarbazone (C5H4N–C2(H)=N3‐N2H–C1(=S)N1HC6H5, Hpytsc‐NPh) in presence of Et3N base led to loss of ‐N2H‐proton and yielded the complex [Ru(pytsc‐NPh)2(Ph3P)2] ( 1 ). Similar reactions of precursor RuCl2[(p‐tolyl)3P]3 with a series of thiosemicarbazone ligands, viz. pyridine‐2‐carbaldehyde thiosemicarbazone (Hpytsc), salicylaldehyde thiosemicarbazone (H2stsc), and benzaldehyde thiosemicarbazone (Hbtsc), have yielded the complexes, [Ru(pytsc)2{(p‐tolyl)3P}2] ( 2 ), [Ru(Hstsc)2{(p‐tolyl)3P}]2 ( 3 ), and [Ru(btsc)2{(p‐tolyl)3P}2] ( 4 ), respectively. The reactions of precursor Ru2Cl4(dppb)3 {dppb = Ph2P–(CH2)4–PPh2} with H2stsc, Hbtsc, furan‐2‐carbaldehyde thiosemicarbazone (Hftsc) and thiophene‐2‐carbaldehyde thiosemicarbazone (Httsc) have formed complexes of the composition, [Ru(Hstsc)2(dppb)] ( 5 ), [Ru(btsc)2(dppb)] ( 6 ), [Ru(ftsc)2(dppb)] ( 7 ), and [Ru(ttsc)2(dppb)] ( 8 ). The complexes have been characterized by analytical data, IR, NMR (1H, 31P) spectroscopy and X‐ray crystallography ( 1 and 5 ). The proton NMR confirmed loss of –N2H– proton in all the compounds, and 31P NMR spectra reveal the presence of equivalent phosphorus atoms in the complexes. In all the compounds, thiosemicarbazone ligands coordinate to the RuII atom via hydrazinic nitrogen (N2) and sulfur atoms. The arrangement around each metal atom is distorted octahedral with cis:cis:trans P, P:N, N:S, S dispositions of donor atoms. 相似文献
48.
Bis(tertiaryphosphine/arsine oxides), Ph2E(O) (CH2)nE(O)Ph2 react with iron(II) iodide and iron(II) tetracarbonyliodide forming com 相似文献
49.
Tarlok S. Lobana Gagandeep Bawa Geeta Hundal A.P.S. Pannu Ray J. Butcher Ben-Jie Liaw Chen W. Liu 《Polyhedron》2007
Reactions of the trans-PdCl2(PPh3)2 precursor with furan-2-carbaldehyde thiosemicarbazone (Hftsc) and thiophene-2-carbaldehyde thiosemicarbazone (Httsc), in 1:1 molar ratios in the presence of Et3N base, removed one Cl and one PPh3 group from the PdII center, and yielded the complexes [Pd(η2-N3,S-ftsc)(PPh3)Cl] (1) and [Pd(η2-N3,S-ttsc)(PPh3)Cl] (2), respectively. However, when a 1:2 molar ratio (M:L) was used, both Cl and PPh3 ligands were removed, yielding the complexes trans-[Pd(η2-N3,S-ftsc)2] (3) and trans-[Pd(η2-N3,S-ttsc)2] (4). Complexes 1–4 have been characterized with the help of analytical data, spectroscopic techniques (IR, 1H and 31P NMR) and single crystal X-ray crystallography. The thiosemicarbazone ligands behave as uninegative N3,S-chelating ligands in complexes 1–4. In contrast, pyrrole-2-carbaldehyde thiosemicarbazone (H2ptsc) and salicylaldehyde thiosemicarbazone (H2stsc) invariably formed the complexes [Pd(η3-N4,N3,S-ptsc)(PPh3)] (5) and [Pd(η3–O, N3,S-stsc)(PPh3)] (6), respectively, and the ligands acted as binegative tridentate donors (N4, N3, S, 5; O, N3, S, 6). 相似文献
50.
Mallika Somayajulu-Ni?u Jagdeep K Sandhu Jerome Cohen Marianna Sikorska TS Sridhar Anca Matei Henryk Borowy-Borowski Siyaram Pandey 《BMC neuroscience》2009,10(1):88