bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fluorescence Quenching of N-Phenyl-1-naphthylamine by Nitriles, Esters, and Amines
Authors: Hamai Sanyo 
Published: July 2006

Abstract
The equilibrium constants for the hydrogen bonding between N-phenyl-1-naphthylamine (NPNA) and proton acceptors (1,4-dioxane, nitriles, esters, and amines) in cyclohexane and the corresponding thermodynamic parameters have been determined. The fluorescence of NPNA is quenched by nitriles, esters, and amines. In the cases of nitriles and esters, the quenching is caused by compounds in which a cyano or carboxyl group is conjugated with a double bond. The rate constants for quenching of the NPNA fluorescence by methyl tiglate, methyl 3,4,5-trimethoxybenzoate, and 2,4,6-trimethylpyridine are 81, 73, and 69% of those by methyl acrylate, methyl benzoate, and pyridine, respectively. These findings can be interpreted in terms of the charge-transfer interaction through the hydrogen bond between NPNA (an electron donor) and the proton acceptors (electron acceptors) except for the amines, for which a mechanism different from the charge-transfer mechanism may be important in explaining the fluorescence quenching.
Unimolecular Decomposition of Silane in Shock Waves
Authors: Tanaka Hitoshi , Koshi Mitsuo , Matsui Hiroyuki 
Published: July 2006

Abstract
Thermal decomposition of silane highly diluted in argon was studied behind incident shock waves at the temperatures ranging from 1250 to 1600 K. The decomposition course was followed by monitoring the infrared emission of silane at 4.4 μm. It was confirmed that the effects of consecutive reactions on the decay rate of silane were negligible under our experimental conditions. The unimolecular rate constants obtained directly from the decay curve of silane were found to be smaller than previous experimental values but consistent with the result of the recent trajectory-RRK calculation. It was also found that the addition of molecular hydrogen or nitrogen monoxide to the reactant mixtures had no effect on the decomposition rate of silane.
Formation of Molecular Complexes of Water-Soluble Porphyrin with Cation–18-Crown-6 Complexes
Authors: Tabata Masaaki , Yamada Isao 
Published: July 2006

Abstract
The formation of molecular complexes of 5,10,15,20-tetrakis(4-sulfonatophenyl)porphine (H2tspp) with cation–18-crown-6 (M(18C6)) has been studied spectrophotometrically at I=0.1 mol dm−3 (MX and MX2, M: Na+, K+, Cs+, NH4+, Ca2+, Sr2+, Ba2+, X: NO3−, Cl−, Br−, I−, SCN−), and pH 7.0 (N,N′-bis(2-sulfonatoethyl)piperazine: PIPES buffer, 2.0×10−3 mol dm−3). The absorption spectrum of H2tspp considerably changed in the presence of both cation and 18-crown-6, but not in the absence of either of them. The formation constants (logK) of the molecular complexes (M(18C6)·H2tspp) were found to be 2.17±0.05, 2.31±0.03, 2.45±0.03, 2.58±0.02, 1.94±0.03, 2.07±0.02, and 2.12±0.02 for Na+, K+, Cs+, NH4+, Ca2+, Sr2+, and Ba2+, respectively at 25.0±0.5 °C and I=0 mol dm−3. Thermodynamic parameters ΔH/(kJ mol−1) and ΔS/(J K−1 mol−1) are −19.9, −25.0; −33.0, −66.0; −29.3, −50.8; −48.5, −113.7; −21.9, −34.2 and −32.5, −68.0 for Na+, K+, Cs+, NH4+, Sr2+, and Ba2+. The enthalpy changes are linearly correlated to the entropy changes. The equilibrium studies show that charge transfer between M(18C6) and porphyrin π-system is a driving force for the formation of the molecular complex (M(18C6)·H2tspp) as well as hydrophobic interaction.
Nonsteroidal Antiinflammatory Drugs. VI. The Crystal and Molecular Structure of (±)-(2S*)-2-[4-((1S*)-2-Oxocyclopentylmethyl)phenyl]propionic Acid and Force-Field Calculations
Authors: Hata Tadashi , Ohashi Yuji , Sasada Yoshio 
Published: July 2006

Abstract
The crystal structure of the title compound was determined by X-ray diffraction techniques. The final R index was found to be 0.072 for 1187 reflections. The torsional angles of the 2-phenylpropionic acid moiety were comparable to those in other antiinflammatory arylpropionic acids. Force-field energy calculations suggested that the α-methyl substituent to the carboxyl group restricts the rotation of the benzene ring about the Cα-phenyl bond. This restricted conformation may be related to the antiinflammatory activity.
Cobalt(III) Complexes of Salen Analog with Thioether Pendant Group. X-Ray Structure Analysis and Thioether Coordination Effects
Authors: Horiuchi Kaoru , Mikuriya Masahiro , Okawa Hisashi , Kida Sigeo 
Published: July 2006

Abstract
A pentadentate salen analog with a pendant thioether group, N,N′-disalicylidene-2-methyl-4-ethylthio-1,2-butanediamine (H2L), formed two types of cobalt(III) complexes, [Co(L)]ClO4·H2O (1) and [Co(L)NH3]PF6·H2O (2). Based on infrared and electronic spectra, the complex 1 was revealed to have a square-pyramidal configuration with the pendant sulfur coordination at the apex. The structure of the complex 2 was determined by single-crystal X-ray analysis. The molecule has a six-cooridnate structure with the coordination of the pendant sulfur and the ammonia molecule at the apical sites, the Co–S and Co–N(NH3) distances being ca. 2.25 and 2.0 Å, respectively. Electrochemical measurements (CV and DPP) for 2 and [Co(salen)(R-NH2)2]PF6 as the reference have revealed that the substitution of thioether sulfur for one of the apical amine ligands results in a positive shift of the CoIII/CoII redox potential. It is also found that the CoIII/CoII reduction of five-coordinate 1 occurs at a significantly high potential compared with six-coordinate 2 and [Co(salen)(R–NH2)2]PF6.
Interaction of Cationic Drugs with Nafion on Electrode Surfaces and Its Applicability to Determination of Electroinactive Drugs
Authors: Matsue Tomokazu , Aoki Atsushi , Uchida Isamu , Osa Tetsuo 
Published: July 2006

Abstract
The interaction of several electroinactive cationic drugs (hexamethonium, quinidine, neostigmine, nicotine and acetylcholine) with Nafion and the applicability of Nafion-coated electrodes to determination of the drugs have been investigated. The addition of a drug to an electrolyte solution containing (ferrocenylmethyl)trimethylammonium (FA+) induced a decrease in the peak current and a shift in the apparent half-wave potential of a cyclic voltammogram for FA+. The decrease in the peak current has been used for determination of the drugs at low concentrations less than 10−3 mol dm−3. The ion-selectivity coefficients of Nafion for the drugs have been determined by an electrochemical method. These drugs showed quite large values and the values seemed to be dependent on the hydrophobicity of the drugs.
Synthesis and Structural Studies of Remirol
Authors: Yamaguchi Seiji , Takai Mayumi , Hanazome Isao , Okada Yûko , Kawase Yoshiyuki 
Published: July 2006

Abstract
One step cyclization of 2′,4′,6′-trihydroxyacetophenone with 1,4-dibromo-2-methyl-2-butene gave two 2-isopropenyl-2,3-dihydrobenzofuran-4,6-diols and a new 3-methyl-2,5-dihydro-1-benzoxepin-6,8-diol. The structure of natural remirol was confirmed by comparison with monomethylated compounds of the former products. Racemic remirol was synthesized from 3,5-dimethoxyphenol in three steps.
High-Pressure Cycloaddition Reaction of Tropone with Furans
Authors: Sugiyama Shigeru , Tsuda Tohru , Mori Akira , Takeshita Hitoshi , Kodama Mitsuaki 
Published: July 2006

Abstract
Thermal reactions of tropone with furan and 2-methoxyfuran mainly gave the endo-[4+2] cycloadducts, the kinetically controlled products, at 3000 bar. In the latter case, the product further reacted with tropone to yield 2:1-adducts. On the other hand, the reaction with 3,4-dimethoxyfuran under similar conditions yielded mainly the exo-[4+2] adducts, the thermodynamically controlled products. The predominant formation of the endo-Diels–Alder adducts with furans under the high-pressure conditions may be valuable from a synthetic point of view.
The 1,3-Dipolar Cycloaddition Reactions of Heteroaromatic Dicyanomethylides with Phenylsulfinylethene and Bis(trimethylsilyl)ethyne: Synthesis of 1,2-Unsubstituted 3-Cyanoindolizines
Authors: Matsumoto Kiyoshi , Uchida Takane , Ikemi Yukio , Tanaka Toshio , Asahi Momoyo , Kato Tomoe , Konishi Hideyuki 
Published: July 2006

Abstract
Pyridinium and diazinium dicyanomethylides underwent 1,3-dipolar cycloaddition-extrusion reactions with phenylsulfinylethene, producing the corresponding 3-cyanoindolizines in moderate to good yields. 1,3-Dipolar cycloadditions of these ylides with bis(trimethylsilyl)ethyne gave either the 1,2-bis(trimethylsilyl)-3-cyanoindolizines or the 1-trimethylsilyl-3-cyanoindolizines, or mixtures of these, depending on the substituents and the presence of another nitrogen atom in the pyridine ring. 1,2-Bis(trimethylsilyl)-3-cyanoindolizines underwent regiospecific protodesilylation at the 2-position upon a treatment with silica gel in refluxing chloroform, yielding 1-trimethylsilyl-3-cyanoindolizines. The 1,2-bis(trimethylsilyl)-, and 1-trimethylsilyl-3-cyanoindolizines suffered from quantitative protodesilylation under catalysis by tetrabutylammonium fluoride to afford 1,2-unsubstituted 3-cyanoindolizines.
Regeneration of NADPH and Hydrogenation of Ketones to Alcohols with the Combination of Hydrogenase, Ferredoxin-NADP Reductase, and Alcohol Dehydrogenase
Authors: Okura Ichiro , Kurabayashi Katsumi , Aono Shigetoshi 
Published: July 2006

Abstract
The regeneration of nicotinamide–adenine dinucleotide phosphate (reduced form, NADPH) by the reduction of NADP by hydrogen gas was carried out with the [hydrogenase–ferredoxin-NADP reductase (FNR)] system. Ketone hydrogenation was tried by the combination of the above system and alcohol dehydrogenase (ALDH), as shown in the following scheme:
(Remark: Graphics omitted.)
In the [hydrogenase–FNR] system, NADP was easily reduced by hydrogen to form NADPH. By adding ALDH to the above system, the hydrogenation of ketone to alcohol was observed. The ketones used in this study were 2-butanone, 2-pentanone, and 2-hexanone. After 8 h, the turnover number of NADP was 13 for 2-butanone, 15 for 2-pentanone, and 10 for 2-hexanone, showing a recurrence of NADP by hydrogen gas.
Anodic Cyanation of 1-Methylimidazoles
Authors: Yoshida Kunihisa , Kitabayashi Hirohito 
Published: July 2006

Abstract
The electrooxidation of several 1-methylimidazoles was performed in MeOH that contains NaCN at a platinum anode in a divided cell. Replacement of an aromatic hydrogen by a cyano group occurred. With 1,2,4,5-tetramethylimidazole, the 2,5-addition of cyano groups to the imidazole ring was achieved, and besides side-chain substitution occurred concurrently.
Asymmetric Allylation with a New Chiral Allylating Agent Prepared from Tin(II) Triflate, Chiral Diamine, and Allylaluminum
Authors: Minowa Nobuto , Mukaiyama Teruaki 
Published: July 2006

Abstract
A chiral allylating agent, readily generated from tin(II) trifluoromethanesulfonate (tin(II) triflate), chiral diamines derived from (S)-proline and allylaluminum, is efficiently employed in the asymmetric allylation of aldehydes and an epoxide. Reaction of a chiral 2-methyl-2-propenylating (methallylating) agent with aldehydes also proceeds smoothly to afford the corresponding homoallylic alcohols in good yields with high enantioselectivities. According to a similar procedure, asymmetric propargylation of aldehydes affords homopropargylic alcohols in good optical purities.
Preparation of New Nitrogen-Bridged Heterocycles. 16. Facile Synthesis of Thieno[2,3-b]indolizine Derivatives
Authors: Kakehi Akikazu , Ito Suketaka , Ohno Yasuhiro , Shiba Shouji , Kamata Sakashi 
Published: July 2006

Abstract
2-Ethoxycarbonyl-3-methyl- and 3-phenylthieno[2,3-b]indolizine derivatives were first synthesized in moderate to good yields by the treatment of tricyclic 5,5a-dihydropyrido[2,1-c]thieno[3,2-e][1,4]thiazines with a dehydrogenating agent. In contrast to the cases of bicyclic 1,9a-dihydropyrido[2,1-c][1,4]thiazines, all of the thienoindolizines obtained here were rearranged products and no desulfurized product could be obtained.
Autoxidation of 1-Methyl- and 1,3-Dimethylazulenes in Polar Aprotic Solvents: Structural Proof for Products and Reaction Pathways
Authors: Takekuma Shin-ichi , Matsubara Yoshiharu , Yamamoto Hiroshi , Nozoe Tetsuo 
Published: July 2006

Abstract
Autoxidation of the title azulenes at 100 °C in HMPA or DMF afforded a wide variety of products: Namely, the oxidation products of the side-chains, 1-substituted azulenes, 1H-inden-1-ols, naphthoquinones, benzenoids, and dimeric and trimeric compounds, with or without rearrangements. 1H NMR (200-MHz) parameters of various azulene derivatives are given for comparative study. Possible reaction pathways for the formation of these products are discussed in comparison with the results of the previous studies on guaiazulene and 4,6,8-trimethylazulene.
Effect of Substituents on the Oxidation Potential of Phthalocyanines and Electrocrystallization
Authors: Orihashi Yuji , Nishikawa Michinori , Ohno Hiroyuki , Tsuchida Eishun , Matsuda Hiro , Nakanishi Hachiro , Kato Masao 
Published: July 2006

Abstract
A series of tetra- or octasubstituted phthalocyaninatocobalt derivatives were prepared and their oxidation behaviors were examined in relation to the nature of substituents. The oxidation potentials of phthalocyanines, especially those of rings were affected by the nature of both substituents and axial ligands. These oxidation potentials were in a linear relation with the Hammett’s constants for substituents or axial ligands. The electrocrystallization proceeded when an oxidation potential higher than that for the phthalocyanine ring was given to the solution. This potential shift was therefore revealed to be an important factor to control the electrocrystallization of these phthalocyanines.
Oxidation of (CD3)2\dotCX Radicals. II. Reaction of (CD3)2CHCl and (CD3)2\dotCCl Radicals with Atomic Oxygen
Authors: Washida Nobuaki , Hatakeyama Shiro 
Published: July 2006

Abstract
The reaction of oxygen atoms with (CD3)2CHCl in a fast flow system was studied with a photoionization mass spectrometer. The (CD3)2\dotCCl radical formed by the initial hydrogen abstraction at the 2-position was detected directly.
(CD3)2CHCl+O(3P)→(CD3)2\dotCCl+OH (1)
The rate data for Reaction 1 were fitted by an Arrhenius expression: k1=(3.5−0.9+1.2)×10−11exp[(−4973±278 cal mol−1)/RT] cm3 molecule−1 s−1 (399–628 K). Among the products formed in the subsequent reaction of (CD3)2\dotCCl radicals with atomic oxygen, CD3CCl=CD2 (31%) produced by the deuterium abstraction and (CD3)2CO (24%) by the oxygen addition were observed. Competition experiments show that (CD3)2\dotCCl radicals react (0.0079±0.0010) times as fast with O2 as with O(3P). In the presence of an excess of O2, CD3CCl=CD2 was observed in decreased yield (3.5%) and (CD3)2CO increased to 56%.
Oxidation of (CD3)2\dotCX Radicals. III. Reaction of 2-Propanol and (CD3)2\dotC(OH) Radicals with Atomic Oxygen
Authors: Washida Nobuaki 
Published: July 2006

Abstract
The reaction of oxygen atoms with 2-propanol was studied in a fast flow system coupled with a photoionization mass spectrometer. Radicals formed in the primary attack of O(3P) atoms on 2-propanol were photoionized by the Xe lamp and identified as the (CH3)2\dotC(OH) radical from (CH3)2CH(OH) and (CH3)2CD(OH) and the (CD3)2\dotC(OH) radical from (CD3)2CH(OH). The major primary product in the subsequent reaction of O+(CD3)2\dotC(OH) was found to be acetone, (CD3)2CO, (62±4%). Formation of 1-propen-2-ol, CD3C(OH)=CD2, by deuterium abstraction and acetic acid, CD3COOH, by oxygen addition were observed in the reaction of O+(CD3)2\dotC(OH). In the reaction of 18O+(CD3)2\dotC(OH), the acetone produced was mostly (CD3)2CO. This fact shows that acetone is produced predominantly by the hydrogen abstraction by O(3P) from the O–H in the (CD3)2\dotC(OH) radical. A part of the acetone is produced also by the addition of O(3P) to the (CD3)2\dotC(OH) radical; i.e., a small but significant signal of (CD3)2C18O was observed in the reaction of 18O+(CD3)2\dotC(OH). The competition experiment between O(3P) and O2 for the (CD3)2\dotC(OH) radical shows that (CD3)2\dotC(OH) react (0.16±0.02) times as fast with O2 as with O(3P). This result suggests that the reaction of (CD3)2\dotC(OH) with O2 is very rapid. It is proposed that the rapid reaction is hydrogen abstraction by O2 from the O–H in the (CD3)2\dotC(OH) radical to form acetone and HO2.
The Crystal Structure of 9-Ethyl-8-hydroxyguanine
Authors: Kasai Hiroshi , Nishimura Susumu , Toriumi Yoshiharu , Itai Akiko , Iitaka Yoichi 
Published: July 2006

Abstract
Analysis of the crystal structure of 9-ethyl-8-hydroxyguanine using X-ray diffraction showed that it is in C-8 keto form. As compared with 9-ethylguanine, significant differences were observed in bond lengths and bond angles of the imidazole ring.
The Synthesis of 12-Ethoxy-4,9-methanoaza[12]annulene, a 12π-Electron Vinylogue of Pyridine
Authors: Ojima J\={u}ro , Masumoto Masayuki , Kuroda Shigeyasu , Hirooka Shuji , Nozawa Yoshihiko 
Published: July 2006

Abstract
The title aza[12]annulene has been synthesized by Beckmann rearrangement of the oxime from the methano[11]annulenone, followed by alkylation of the resulting lactam. Examination of the 1H NMR spectrum indicates that the aza[12]annulene is slightly paratropic.
Effect of 1-Methoxy-5-methylphenazinium Methyl Sulfate on Photocurrent Produced by Rhodospirillum rubrum Chromatophores
Authors: Erabi Tatsuo , Matsumoto Kiyoharu , Itoh Hideki , Takahashi Noritaka , Nishimura Kumiko , Wada Masanori 
Published: July 2006

Abstract
A cathodic photocurrent produced by chromatophores was measured in the presence of 1-methoxy-5-methylphenazinium methyl sulfate (methoxy-PMS). The magnitude of the photocurrent was a function of the wavelength of the incident light, and the photocurrent action spectrum was in agreement with the absorption spectrum of chromatophores. The photocurrent also depended on the concentration of methoxy-PMS or of chromatophores.
Effect of Post-Treatments on the Stability of the Langmuir–Blodgett Film of Fatty Acid Salt in Vacuum
Authors: Iwahashi Makio , Yamaguchi Yoshimi , Kobayashi Koichi , Seimiya Tsutomu 
Published: July 2006

Abstract
The effects of the following treatments on the stability of the Langmuir–Blodgett (L/B) film of fatty acid salt in vacuo have been investigated by radiotracer method: (I) Skeletonization of the L/B film. (II) Transformation of the fatty acid molecules remaining in the L/B film into its soap molecules. (Ill) Perfect formation and deposition of the metal soap monolayer.
Synthetic Photochemistry. XXXIX. Sensitized-Photooxygenation of 2-Benzyltropone, 2-[Hydroxy(4-nitrophenyl)methyl]tropone, and 2-(1-Hydroxy-2-oxo-2-phenylethyl)tropone. A Quenching Effect of Hydroxyl Group in the Vicinity of the Reaction Site
Authors: Mori Akira , Suizu Hiroshi , Takeshita Hitoshi 
Published: July 2006

Abstract
Singlet-oxygen oxidation of 2-[hydroxy(4-nitrophenyl)methyl]tropone gave 6,7-dioxabicyclo[3.2.2]nona-3,8-dien-2-one derivatives in good yields. A change of regioselectivity of the oxygenation with a remarkable rate of enhancement (23 times) in deuteriomethanol vs. methanol could be best explained in terms of the quenching of singlet oxygen by the free hydroxyl group in the vicinity of the reaction site. Similarly studied were 2-(1-hydroxy-2-oxo-2-phenylethyl)tropone and 2-benzyltropone. The stereochemistry of the oxygen adducts was elucidated by a 1H NMR chemical-shift comparison.
1H,1H-Perfluoroalkylation of Enol Silyl Ethers with (1H,1H-Perfluoroalkyl)phenyliodonium Triflates. A New Method for the Preparation of β- and δ-Trifluoromethyl Carbonyl Compounds and Their Higher Perfluoroalkyl Homologues
Authors: Umemoto Teruo , Gotoh Yoshihiko 
Published: July 2006

Abstract
The reaction of enol trimethylsilyl ethers of carbonyl compounds with (1H,1H-perfluoroalkyl)phenyliodonium triflates was promoted successfully by potassium fluoride in dichloromethane at room temperature, giving β-perfluoroalkyl (Rf; CF3, C2F5, i-C3F7, n-C7F15) carbonyl compounds in good yields. An enol silyl ether of an α,β-unsaturated carbonyl compound gave a δ-Rf-α,β-unsaturated carbonyl compound selectively.
Interactions between a Synthetic Phospholipid Vesicle and Cationic Surfactants
Authors: Takasaki Mitsuhiro , Takisawa Noboru , Shirahama Keishiro 
Published: July 2006

Abstract
The interaction between a synthetic phospholipid derivative, the 1,3-ditetradecyl-rac-glycerophosphatidylcholine (2C14–Gly–PC) vesicle, and two cationic surfactants, N-tetradecylpyridinium bromide (TDPBr) and N-tetradecyltrimethylammonium bromide (TDTMABr), were investigated in the hope of obtaining a better understanding of the mechanism of the growth of the vesicle size by the “surfactant-removal” method. The binding isotherms of these surfactants to the lipid vesicle obtained by the surfactant selective electrode were characterized by two-step binding processes; the Langmuir adsorption mechanism in the initial binding, followed by a markedly positive cooperative process. The variation in the hydrodynamic radius, as measured by quasi-elastic light scattering, and the quenching kinetics of pyrene fluorescence with the TDPBr surfactant solution as measured by a stopped-flow method, share a tendency with the binding behavior. The van’t Hoff plots of the initial binding data give a slightly negative enthalpy change, ΔH°, for TDPBr and a relatively large positive ΔH° for TDTMABr. The microenvironmental polarity around pyrene in the molecular assemblies was assessed by means of fluorescence spectroscopy.
The Phase Transition of 1-Alkyl-4-aza-1-azoniabicyclo[2.2.2]octane Bromides, Cn-DABCO-Br (11≤n≤22)
Authors: Imamura Kengo , Nogami Takashi , Shirota Yasuhiko , Ishioka Tsutomu , Kobayashi Masamichi 
Published: July 2006

Abstract
The phase transitions of a series of 1-alkyl-4-aza-1-azoniabicyclo[2.2.2]octane bromides were studied on the basis of DSC, measurements of the ionic conductivities of the bromide anion, and Raman spectroscopy. Two endothermic signals were observed at the temperatures of Tc1 and Tc2(Tc1&lt;Tc2) for most of the materials. The transition enthalpies and transition entropies were not very different for the transitions at Tc1, irrespective of the alkyl-chain lengths attached to DABCO nitrogens. On the other hand, these values tended to increase with an increase in the alkyl-chain lengths for the transitions at Tc2. The temperature dependences of the ionic conductivities of the bromide anion showed abrupt increases in the conductivities by a factor of 2–10. The conductivity jumps were observed around Tc2. The temperature dependences of the Raman spectra gave detailed information on the phase transition; (1) the change in the subcell structure took place at Tc1, with the concomitant occurrence of a conformational change in the alkyl group; (2) above Tc2, the alkyl chain takes a liquid-like disordered form, and a rotational motion of the DABCO portion sets in.
Orientation-Dependent 1H and 13C Isotropic Shifts of Low-Spin Tetracyano(1,2-diamine)ferrates(III)
Authors: Kuroda Yoshitaka , Goto Masafumi , Sakai Tomoya 
Published: July 2006

Abstract
Paramagnetic 1H and 13C NMR signals of low-spin tetracyanodiamineferrates(III), [FeIII(CN)4(diamine)]−, containing ethylenediamine, (R)-1,2-propanediamine, (1R,2R)-trans-cyclohexanediamine, and N,N′-dimethylethylenediamine, were assigned by the use of rapid electron exchange between the FeIII complex and the diamagnetic FeII complex with an identical set of ligands. The C–H on the five-membered chelate ring showed isotropic shifts with different signs depending on their orientations: 14–18 ppm downfield and ca. 16–23 ppm upfield for axial and equatorial protons respectively. The isotropic shifts for the 13C nuclei were attenuated, their signs alternating with each separation by one carbon-carbon bond from the metal ion. The isotropic shift is compared with that of the NiII complex qualitatively in terms of the dipolar and Fermi contact shifts.