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1.
Summary Complexes of manganese(II) with the tridentate oxime ligand 2,6-diacetylpyridine dioxime (H2dapd) have been synthesized and characterized. The complexes [Mn(H2dapd)X2] are pentacoordinate for X = Cl, Br or I but apparently octahedralvia bridging anions for X = NCS or NCSe. The complex [Mn(H2dapd)(NO3)2] adopts an octahedral structure involving monodentate and bidentate coordination of nitro groups. The complexes [Mn(H2dapd)2]X2 (X = Cl, Br, I, NO3, NCS or NCSe) involve an octahedral cation.  相似文献   

2.
Preparation and Spectroscopic Characterization of Bond Isomeric Halogenoselenocyanato-Osmates(IV) and -Rhenates(IV) By oxidative ligand exchange of appropriate chloro-iodo complexes of OsIV or ReIV with (SeCN)2 in CH2Cl2 or by heterogeneous reaction with Pb(SeCN)2 or AgSeCN in CH2Cl2 the new complexes cis-[OsCl4(NCSe)(SeCN)]2?, tr.-[OsCl4Br(NCSe)]2?, tr.-[OsCl4Br(SeCN)]2?, [ReCl5(NCSe)]2?, [ReCl5(SeCN)]2?, tr.-[ReCl4I(NCSe)]2?, tr.?[ReCl4(NCSe)(SeCN)]2? and tr.?[ReCl4(NCSe)2]2? are formed and isolated as pure compounds by ion exchange chromatography on DEAE-cellulose. The bond isomers are significantly distinguished by the frequencies of innerligand vibrations: n?CN(Se) > n?CN(N); n?CSe(N) > n?CSe(Se); δNCSe > δSeCN. The electronic spectra (10 K) of the solid salts reveal a bathochromic shift for the charge transfer bands of the Se isomers as compared with the corresponding N isomers. The intra-configurational transitions are observed for the OsIV complexes at 600 to 2400 and for the ReIV complexes at 500 to 1600 nm. The 77Se nmr signals of the OsIV bond isomers are registrated for Se binding in the region 970 to 1040 ppm, for N coordination downfield at 1540 to 1640 ppm.  相似文献   

3.
Mononuclear NCS? containing complexes, [M(NCS)2L] (L?=?N,N-bis(3,5-dimethylpyrazol-1-ylmethyl)aminomethylpyridine), [Cu(NCS)2L′] (L′?=?N-(3,5-dimethylpyrazol-1-ylmethyl)aminomethylpyridine), and NCSe? containing complexes [ML(NCSe)(H2O)]ClO4 (M?=?Ni+2, Co+2) have been synthesized and characterized by elemental analysis, spectroscopic, and physico-chemical methods. Structural studies of [Cu(NCS)2L′] show copper is five coordinate with distorted trigonal bipyramidal geometry with two cis NCS?. [M(NCS)2L] and [ML(NCSe)(H2O)]ClO4 (M?=?Ni+2 and Co+2) are expected to be octahedral.  相似文献   

4.
The effects of Cd [Cd(NO3)2] and its complexes with nicotinamide (NA) [Cd(ac)2(NA)2, Cd(NCS)2(NA)2, Cd(NCSe)2(NA)2] were examined by using the algae Scenedesmus quadricauda and Chlorella vulgaris as a function of Cd speciation in a well-defined aqueous medium. The parameters observed during the experiments were algal growth inhibition, chlorophyll a and b content, oxygen evolution and Cd adsorption by algal cells. With regard to growth and production of chlorophylls (Chla, Chlb), the most toxic compound was Cd(NO3)2. On the basis of EC50 values for these parameters, the following rank order can be arranged for both algae: Cd(NO3)2?>?Cd(ac)2(NA)2?>?Cd(NCS)2(NA)2?>?Cd(NCSe)2(NA)2. While Cd(NO3)2 in EC50 concentration for algal growth also reduced oxygen evolution nearly by half, all Cd(II) complexes used in EC50 concentrations for the same parameter reduced oxygen evolution less. When a comparison was done for Cd(NO3)2, all Cd(II) complexes stimulated oxygen evolution in both algal species. Base on the adsorbed Cd quantity, the tested compounds for both algae could be arranged in the following sequence: Cd(NO3)2?>?Cd(ac)2(NA)2?>?Cd(NCS)2(NA)2?>?Cd(NCSe)2(NA)2. The results confirmed that the adsorbed Cd amount markedly exerted its influence on algal growth and intensity of their physiological processes. Higher sensitivity was confirmed for alga S. quadricauda, which adsorbed a higher amount of Cd, and reduction of all observed parameters in this alga was more intensive than in C. vulgaris. As less toxic for both algae was confirmed the complex Cd(NCSe)2(NA)2.  相似文献   

5.
Preparation and Characterization of the Pentammine Complexes [Os(NH3)5(NCS)]2+ and [Os(NH3)5(NCSe)]2+ The new pentammine complexes [Os(NH3)5(NCS)]2+ and [Os(NH3)5(NCSe)]2+ are prepared from the reaction of [Os(NH3)5(CF3SO3)](CF3 SO3)2 with NH4SCN and KSeCN, respectively, in acetone, and subsequent purification by ion exchange chromatography on carboxymethyl cellulose. Evidence of N-bonding in both cases is given by the vibrational spectra, indicating that Os3+ is in terms of Lewis acidity harder than Ru3+, Rh3+, and Ir3+. I.r. and Raman spectra are interpreted according to local C4v symmetry around Os, and the presumed assignments are confirmed by comparison with the i.r. spectra of the perdeuterated compounds. In the electronic spectra of both complexes charge transfer bands at 412 nm (NCS) and 498 nm (NCSe) are observed, respectively. Further weak absorptions near 4500 and 5100 cm?1, which are in correlation with electronic Raman bands, are assigned to intraconfigurational transitions within the 2T2g (Oh) ground term, split into three Kramers doubletts by spin-orbit coupling and lowered symmetry. Electrochemical measurements demonstrate a stabilisation of +III and +II oxidation states by π-back donation to —NCS and —NCSe ligands.  相似文献   

6.
Complexation of cobalt(II) and nickel(II) with thiocyanate ions has been studied by precise spectrophotometry in aqueous and micellar solutions of a nonionic surfactant Triton X-100 of varying concentrations (20–100 mmol-dm–3). With regard to cobalt(II), the formation of [Co(NCS)]+, [Co(NCS)2], and [Co(NCS)4]2– was established. The formation constant of [Co(NCS)4]2–, is increased with increasing concentration of the surfactant, suggesting that the [Co(NCS)4]2– complex is formed in micelles. In contrast, the formation constants of [Co(NCS)]+ and [Co(NCS)2] are remained practically unchanged. On the other hand, with nickel(II), the formation of sole [Ni(NCS)]+ and [Ni(NCS)2] was established in both aqueous and micellar solutions examined, their formation constants being also remained unchanged. Interestingly, no higher complex was confirmed in the nickel(II) system, unlike cobalt(II). The unusual affinity of the [Co(NCS)4]2– complex with micelles will be discussed from thermodynamic and structural points of view.  相似文献   

7.
Summary The reaction of warm alcoholic solutions of acetates of CoII, MnII, ZnII and NiII with 2, 6-diacetylpyridine andS-methylisothiosemicarbazide hydrogen iodide yielded the complexes: [Co(H2L)I2]·H2O, [Mn(H2L)(MeOH)2]I2, [Zn(H2L)(MeOH)I]I and [Ni(HL)]I, (H2L=the pentadentate pentaaza-ligand 2, 6-diacetylpyridine bis(S-methylisothiosemicarbazone)). The reaction of methanolic solutions of [Ni(HL)]I and NH4NCS or LiOAc.2H2O, give [Ni(HL)]NCS and NiL, respectively. For the complexes of CoII, MnII and ZnII, a pentagonal bipyramidal configuration is proposed, with H2L in the equatorial plane and two unidentate ligands (I and/or MeOH) in the axial positions. The complexes [Ni(HL)]X (X=I or NCS) and NiL probably have monomeric five- and dimeric six-coordinate structures, respectively, in which only the chelate ligand is involved in coordination.  相似文献   

8.
Abstract

Complexes of [MM′(NCSe)4] (M=Co, Ni and M′=Zn, Cd, Hg) with certain ligands(L) viz. 3-cyanopyridine, 3-aminopyridine, nicotinamide and isonicotinic acid hydrazide have been synthesized and characterized. Their molar conductance, magnetic moment, infrared and electronic spectral studies indicate that these complexes are of three types: cationic-anionic viz. [ML6] (Zn(NCSe)4), monomeric bridged viz. [(L4)M(NCSe)2Cd(SeCN)2] and polymeric bridged viz. [dbnd](SeCN)2L2M(NCSe)2Hg(SeCN)2[dbnd]. The softness and hardness of M, M′, -N-(NCSe′) and -Se-(SeCN-) have also been calculated to derive certain conclusions.  相似文献   

9.
Zusammenfassung Es wurden 39 neue Komplexsalze durch doppelte Umsetzung aus wäßrig-alkohol. Lösungen der folgenden Reineckeat-Analoga: [Cr(NCS)4(o-Toluidin)2]–, [Cr(NCS)4(m-Toluidin)2]– und [Cr(NCS)4(p-Toluidin)2]– und Hexammin-, Monoacido-pentammin-und Diacido-tetrammin-kobalt(III)-komplexsalze erhalten.Es wurden in einigen Fällen Abweichungen in physikochemischen Eigenschaften, wie Farbtönung, Kristallform, Löslichkeit und papierchromatographischeR F-Werte, bei den stellungsisomeren Salzen vom Typus: Kation·[Cr(NCS)4(Toluidin)2] und auch bei den Koordinationsisomerpaaren: [Co(DH)2(o-Toluidin)2][Cr(NCS)4(p-Toluidin)2] und [Co(DH)2(p-Toluidin)2] [Cr(NCS)4(o-Toluidin)2], usw. beobachtet.
Cobalt(III) ammine derivatives of some reineckate analogues with toluidines
39 new complex salts were prepared by double conversion of the reineckate analogues [Cr(SCN)4(o-toluidine)2]–, [Cr(SCN)4(m-toluidine)2]–, and [Cr(SCN)4(p-toluidine)2]– with the hexammine, monoacido-pentammine and diacido-tetrammine complexes of Co(III). In some of the position and coordination isomers deviations from the standard physico-chemical properties, i.e. color, crystal form, solubility and paper chromatographyR f-values were observed.
  相似文献   

10.
Diorganotin (IV) complexes SnR2X2 (R = Me, Ph; X = Cl, NCS) form a series of versatile complexes when react with bidentate substituted pyridyl ligands. The reaction of dimethyltin dichloride with 5,5′‐dimethyl‐2,2′‐bipyridine (5,5′‐Me2bpy) resulted in the formation of [SnMe2Cl2(5,5′‐Me2bpy)] ( 1 ). Moreover, the reaction of SnMe2(NSC)2 with 4,4′‐di‐tert‐butyl‐2,2′‐bipyridine (bu2bpy), 1,10‐phenanthroline (phen) and 4,7‐diphenyl‐1,10‐phenanthroline (bphen) affords the hexa‐coordinated complexes [SnMe2(NCS)2(bu2bpy)] ( 2 ), [SnMe2(NCS)2(phen)] ( 3 ) and [SnMe2(NCS)2(bphen)] ( 4 ), respectively. The resulting complexes have been characterized using elemental analysis, IR, multinuclear NMR (1H, 13C, 119Sn) and DEPT‐135° NMR spectroscopy. On the other hand, the reaction of diphenyltin dichloride with 2,2′‐biquinoline (biq) and 4,7‐phenantroline (4,7‐phen) led to the formation of polymeric complexes of [SnPh2Cl2(4,7‐phen)]n ( 5 ) and [SnPh2Cl2(biq)]n ( 6 ). The NMR spectra, however, reveal the ligand lability in solution and suggest a coordination number of 5 . The X‐ray crystal structures of complexes [SnMe2Cl2(5,5′‐Me2bpy)] ( 1 ), [SnMe2(NCS)2(bu2bpy)] ( 2 ) and [SnMe2(NCS)2(bphen)] ( 4 ) have been determined which reveal that the geometry around the tin atom is distorted octahedral with trans‐[SnMe2] configuration. Interestingly, the crystal structure of (H2biq)2[SnPh2Cl4]?2CHCl3 ( 7 ) was characterized by X‐ray crystallography from a chloroform solution of [SnPh2Cl2(biq)]n ( 6 ) indicating the formation of doubly protonated [H2biq]+ and [Ph2SnCl4]2? which are stabilized by a network of hydrogen bonds with a feature of trans‐[SnPh2]. The 3D Hirshfeld surface analysis and 2D fingerprint maps were used for quantitative mapping out of the intermolecular interactions for 1 , 2 , 4 and 7 which show the presence of π‐π and hydrogen bonding interactions which are associated between donor and acceptor atoms (N, S, Cl) in the solid state.  相似文献   

11.
DFT methods were utilized to study SCO complexes. [Fe(2btz)2(NCX)2] (2btz = 2,2′‐bithiazoline, X = S ( 1 ) and Se ( 2 )), [Fe(phen)2(NCX)2] (phen = 1,10‐phenantroline, X = S ( 3 ) and Se ( 4 )), and [Fe(bpy)2(NCS)2] ( 5 ) (bpy = 2,2′‐bipyridine) compounds, which have experimentally shown SCO behavior, were calculated. B3LYP, B3LYP*, OPBE, and OLYP with 6‐31G* and 6‐311 + G** basis sets were employed to calculate the ΔEHS/LS energy gap as a clue to find complexes with SCO behavior. It is found that calculated result by B3LYP* with c3 = 0.14 and OPBE methods and 6‐31G* basis set are in agreement with experimentally observed SCO complexes. Then, newly designed Fe(N‐N)2(X)2 complexes, where N‐N are bidentate nitrogen donor chelating ligands and X= SCN‐, SeCN‐, Cl‐, Br‐, I‐, were chosen to see their potential to be SCO compounds. ΔEHS/LS for potential SCO complexes are estimated from 0.8 to 6.5 kcal/mol in B3LYP* and 0.6–5.7 kcal/mol in OPBE. These calculations suggest [Fe(bpy)2(NCSe)2], [Fe(5dmbpy)2(NCS)2], and [Fe(3‐BrPhen)2(NCSe)2] compounds have the ability to show SCO behavior. © 2016 Wiley Periodicals, Inc.  相似文献   

12.
A template synthesis procedure yielded [Ni(HL1)NH3]I, where HL1 is the monoanion of the terdentate ONN benzoylacetone S-methylisothiosemicarbazone ligand. The reaction of this complex with an excess of NH4NCS, pyridine, or hydrazine resulted in the complexes [Ni(HL1)(NH3)NCS] and [Ni(L1)A] (A = Py, N2H4). The monoanionic form of the ligand is obtained by deprotonation of the enolic form of the benzoylacetone moiety, whereas the dianion is formed by additional deprotonation of the terminal NH2 group. Finally, the reaction of [Ni(HL1)NH3]I with salicyladehyde produced the NiL2 complex in which L2 stands for the dianion of the ONNO ligand N(1)-2-butylidene-4-oxo-4-phenyl-N(4)-salicylidene-S-methylisothiosemicarbazide. All complexes are diamagnetic and have a square-planar configuration, except for [Ni(HL1)(NH3)NCS], for which te data of i.r. spectra suggest a square-pyramidal structure. The electronic absorption spectra of the ethanolic solutions of all complexes are characteristic of typical square-planar coordination of nickel(II).  相似文献   

13.
Zusammenfassung Es wurden 29 neue Komplexsalze der Säure: H[CoDim 2 **(NCSe)2] erhalten. Spektrophotometrische Messungen wurden im UV- und IR-Bereiche durchgeführt. Die Kinetik der Aquotisierung der [CoDim 2(NCSe)2]–-Ionen wurde untersucht. Die Ergebnisse wurden mit den kinetischen Parametern der Aquotisierung der analogen [CoDim 2 X 2]–-Ionen (mitX=Cl, Br, J, NCS) verglichen.
Kinetics and mechanism of substitution reactions in complex compounds, XXII.: New derivatives of hydrogen bis-(dimethyl-glyoximatodiselenocyanato)-cobaltiatic(III) acid and kinetics of the hydrolysis of the [CoDim2(NCSE)2]– ion
A series of 29 novel complex salts of the acid H[CoDim 2(NCSe)2] has been prepared and characterized. UV, Vis. and IR spectra were recorded and the aquation kinetics of the [CoDim 2(NCSe)2]– ions studied. Results were compared with kinetic parameters of the aquation of the analogous [CoDim 2 X 2]– ions, whereX=Cl, Br, J, SCN.

Mit 2 Abbildungen

Aquotisierung = Austausch eines Komplexliganden gegen Wasser.  相似文献   

14.
The Re(NO)2+ moiety as [Re(NO)(NCS)3H2O]− or [Re(NO)(NCS)2(L-L)H2O]· [L-L = phen (1,10-phenanthroline) or bipy (2,2′-bipyridine)] undergoes proton-induced oxidation reaction with HX (X = Cl, Br) to produce a Re(NO)3+ moiety. The spectral and physico-chemical data suggest that the anionic complex is 5 coordinate and the neutral one is 6 coordinate with axial NO group and two NCS ligands intrans-equatorial positions. The complex, [Re(NO)(NCS)2(phen)Br]·H2O shows complicated magnetic behaviour which is discussed in the paper. The ESR spectrum of this compound shows typical rhenium hyperfines and <g>-tensor anisotropy compatible with the loss of axial symmetry. However, the spectrum of [Re(NO)(NCS)2Br2]− quite reasonably shows axial symmetry, other features being grossly comparable to the L-L compounds. The anionic species and the neutral L-L complex show irreversible one-electron oxidation waves at different voltages. This may correspond to a conversion of Re(NO)3+ to Re(NO)4+ in both the cases. Interestingly enough, only the neutral complexes exhibit an irreversible reduction wave due probably to a conversion of Re(NO)3+ to Re(NO)2+.  相似文献   

15.
The solid reaction between [Cr(NH3)6]X3(X? = Cl, I, SCN and NO3) and L-α-alanine was studied under continuous rise in temperature and isothermal heating. Under continuous rise in temperature, the main products were [Cr(NCS)3-(NH3)3] (X? = NCS) and [Cr(L-ala)3] (X? = NO3), when [Cr(NH3)6]Cl3 and [Cr(NH3)6]I3 as starting complexes were used; in both cases only the decomposition proceeds. Under isothermal heating at 150°C the main products were [CrCl(NH3)5]-Cl2 (X? = Cl), [Cr(NH3)6]I2 (X? = I), [Cr(NCS)3(NH3)3] (X? = SCN) and [Cr(L-ala)3] (X? = NO3). In those matrix reactions, the ease of anion coordination was: SCN? > Cl? > I? > alanine. For the synthesis of tris(alaninato)chromium(III) complex the most desirable starting complex was [Cr(NH3)6](NO3)3.The solid state reaction between [Cr(en)3]X3 type complexes and NH4X (X? = F, Cl, Br, I and SCN), KX (X? = Cl, Br and I), and NaSCN have been reported by Wendlandt and Stembridge1. They reported that the reaction product in most cases, was cis-[Cr(en)2Y2]X, where Y and X are the same or different anions, depending upon the matrix material employed and the thermal matrix method appears to be a useful new route for the synthesis of bis(ethylendiamine(chromium(III) complexes.In the previous paper2, the solid state reaction between [Cr(NH3)6](NO3)3 and L-amino acids has been utilized in the preparation of tris(amino acidato)chromium(III) complexes. The preparation of [Cr(L-ala)3] by the solid state reaction between [Cr(NH3)6](NO3)3 and L-alanine have been reported. No studies on the effect of the counter-ion have been reported.In this paper, various hexaamminechromium(III) complexes, [Cr(NH3)6]X3 (X? = Cl, I, SCN and NO3), were heated with L-α-alanine under continuous rise in temperature and under isothermal heating at 150°C for studies on the ease of anion coordination. It will seen that the anion which replaces the ammonia in the hexaamminechromium(III) complex comes from either the alanine or counter-ion.  相似文献   

16.
Cobalt(II) complexes of the type Co[Cu(NCS)2]2 · L, where L is acetophenonebenzoylhydrazone (Abh), acetophenoneisonicotinoylhydrazone (Ainh), acetophenonesalicyloylhydrazone (Ash), acetophenoneanthraniloylhydrazone (Aah), p-hydroxyacetophenonebenzoylhydrazone (Phabh), p-hydroxyacetophenoneisonicotinoylhydrazone (Phainh), p-hydroxyacetophenonesalicyloylhydrazone (Phash), and p-hydroxyacetophenoneanthraniloylhydrazone (Phaah) were synthesized and characterized by elemental analyses, molar conductance, magnetic moments, electronic and IR spectra, and X-ray diffraction studies. The complexes are insoluble in common organic solvents and are non-electrolytes. These complexes are coordinated through the >C=O and >C=N groups of the hydrazone ligands. The magnetic moments and electronic spectra suggest a spin-free octahedral geometry around Co(II). The X-ray diffraction parameters (a, b, c) for Co[Cu(SCN)2]2 · Ainh and Co[Cu(SCN)2]2 · Phabh correspond to orthorhombic and tetragonal crystal lattices, respectively. The complexes show a fair antifungal and antibacterial activity against a number of fungi and bacteria. The activity increases with increasing concentration of the compounds. The text was submitted by the authors in English.  相似文献   

17.
Two new complexes, [Ru(phen)2(ppd)]2+ ( 1 ) and [Ru(phen)(ppd)2]2+ ( 2 ) (ppd=pteridino[6,7‐f] [1,10]phenanthroline‐11,13(10H,12H)‐dione, phen=1,10‐phenanthroline) were synthesized and characterized by ES‐MS, 1H‐NMR spectroscopy, and elemental analysis. The intercalative DNA‐binding properties of 1 and 2 were investigated by absorption‐spectroscopy titration, luminescence‐spectroscopy studies, thermal denaturation, and viscosity measurements. The theoretical aspects were further discussed by comparative studies of 1 and 2 by means of DFT calculations and molecular‐orbital theory. Photoactivated cleavage of pBR322 DNA by the two complexes were also studied, and 2 was found to be a much better photocleavage reagent than 1 . The mechanism studies revealed that singlet oxygen and the excited‐states redox potentials of the complex may play an important role in the DNA photocleavage.  相似文献   

18.
Ionic compounds, [Q] [R2SnX(dmit)][dmit=1,3-dithiole-2-thione-dithiolate; Q=1,4-dimethylpyridinium or tetraalkylammonium; R=Phor alkyl; X=Cl, Br, I, NCS, NCSe, or N3] have been obtained by (a) from R2SnX2 and [Q]2[Zn(dmit)2] in the presence of excess QX,(b) from halide exchange reactions in acetone solution between [Q] [R2SnCl(dmit)]and a halide or pseudohalide source, or (c) by addition of QX to [R2Sn(dmit)]. Crystalstructure determinations of [NEt4] [Ph2SnI(dmit)] and [1,4-Me2pyridiniuml [Ph2SnBr(dmit)] as well as of the mixed halides, [1a, 1b, 4a, 2] [Ph2SnClnI1−n(dmit)] (n=0.57, 0.42 or0.22), indicated that the tin atoms have distorted trigonal bipyramidal geometries in the anions,with the X ligand and a dithiolato atom in the axial sites. The [R2SnX(dmit)]− anions remain essentially intact in organic solvents, but lose X− on extractionwith H2O to give the neutral species, R2Sn(dmit).  相似文献   

19.
Abstract

A series of compounds of the type Cd(XCN)4M (X=S and Se; M=Mn, Fe, Co and Zn) have been prepared and characterized. These compounds crystallize in the tetragonal system: space group I4[sbnd]S4 2. The bidentate thiocynate and selenocyanate ligands coordinate to the “hard” M(II) ions through the nitrogen atom and the “soft” Cd(II) ion through the sulfur or selenium atom. The Cd[sbnd]Se bond in Cd(XCN)4 M is slightly stronger than the Cd[sbnd]S bond while the M[sbnd]NCSe bond is slightly weaker than the M[sbnd]NCS bond. The M(II) ions tetrahedrally coordinated by the nitrogen end of XCN? are in the high spin state. The [sbnd]NCS and [sbnd]NCSe ligands are located at about the same place in the spectrochemical series.  相似文献   

20.
The infrared spectra (500–140 cm?1) of the complexes [M(pyridine)n(NCS)2] (n = 2, M = Mn, Co, Ni, Cu, or Zn; n = 4, M = Mn, Fe, Co, or Ni) are discussed. The v/M-pyridine and v/M-NCS bands are assigned by observing the band shifts induced by isotopic labelling of the coordinated pyridine and isothiocyanate, by comparing the spectra with those of the [M(pyridine)2Cl2] complexes and from symmetry considerations based on their known structures. The two types of metal-ligand stretching bands occur within a rather narrow frequency range and there is evidence of some vibrational coupling between these two modes. Some earlier assignments of vM-pyridine bands require revision. The spectra of the yellow [Fe(py)4(NCS)2] complex and its violet oxidation product suggest that the oxidation reaction involves the transformation of trans-[Fe(py)4(NCS)2] into cis-[Fe(py)3(NCS)3]  相似文献   

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