CrCl3 Research Articles

HYDROGENATION OF BENZENE IN BATCH REACTOR

In this article is considered hydrogenation of benzene in liquid phase at presence rhodium support catalyst.where as carrieris usedpillar structural montmorillonite obtaining from bentonite clay..The degree of using an internal surface of porous system is depended.of the size particles.Increase the concentration of chromium above 20 mmole per gram of clay does not lead to the further growth of distance. It is probably connected by that in a solution there are not hydrolized forms of chromium chloride which do not influence formation pillar structures. Modifying montmorillonite minerals containing in bentonite clay gives to them heat resistance. The specific surface of samples(containing 15-30 mmole Cr3+) were defined after heat treatment at 180°C are 240-260 m2 /g and increasing the temperature up to 500-560°C decreases this value insignificant to 220-240 м2 /г, accordingly. Not modified bentonite clay lost their porosity at 140°C, and a specific surface made 20 m2 /g. Besides reaction of hydro-dehydrogenation of cyclic hydrocarbons a huge interest are represented in hydrogen technology. Everyone mole of benzene and its derivatives attaching of three and more quantities of hydrogen, and are unique objects at storages and transportation of hydrogen. Thereby, necessity to develop of catalysts of hydro-dehyrogenation also follows under rather soft conditions. developed rhodium support catalyst for hydrogenation of benzene and defined the factor of efficiency using the internal surface of porosity systems. Presence of water in hydrogenated system leads to phasic course of restoration of benzene on a surface of the catalyst with formation cyclohexane and cyclohexene. The received experimental results expand a circle of data in the field of hydrodearomatization motor fuels, especially transformations of aromatic hydrocarbons cycloalkans

Effect of chromium chloride on serum calcium and phosphate levels of stinging catfish Heteropneustes fossilis

The present study was aimed to investigate the effects of chromium chloride on the blood electrolytes of Heteropneustes fossilis for short- and long-term exposure. In short-term exposure the fish were subjected to 50% of 96-h LC50 value of chromium chloride for 96-h. In long-term exposure the experiment was performed for 30 days by using 10% of 96-h LC50 value of chromium chloride. Fish were killed on each time intervals from control and experimental groups after 24, 48, 72, and 96 h in short-term exposure and after 5, 10 15 and 30 days in long-term experiment. Blood samples were analyzed for calcium and inorganic phosphate levels. Acute exposure of chromium chloride caused a decrease in the serum calcium levels after 48 h in fish H. fossilis which persists till the close of the experiment (96 h). The serum inorganic phosphate levels remain unaffected till 48 h in the chromium chloride. At 72 h and 96 h the levels exhibit a decrease. Chronic chromium chloride caused a decrease in serum calcium levels at day 10. This decrease continues till 15 days thereafter levels tend to rise approaching control level. Serum phosphate level of the chromium treated fish decreases on day 15 and 30.

Magnetic Exchange Field Modulation of Quantum Hall Ferromagnetism in 2D van der Waals CrCl3/Graphene Heterostructures.

The efforts toward the experimental realization of spin-polarized transports in ideal materials or platforms, such as the magnetized graphene or various quantum Hall states, is a research hotspot in spintronics. Magnetic van der Waals materials open the door for exploring various physical phenomena, technologies, and integrating novel spintronic devices seamlessly within the 2D limit. Here, we demonstrate magnetic proximity effect in chromium trichloride (CrCl3)/bilayer graphene (BLG) heterostructures by low-temperature transport measurements. An effective exchange field induced in BLG has been demonstrated by the Zeeman spin Hall effect via nonlocal measurements. Furthermore, the exchange field modulates the quantum Hall ground state of BLG and thus favors the formation of a canted antiferromagnetic (CAF) phase in an external perpendicular magnetic field (B⊥). Asymmetric nonlocal magneto-transport behaviors are also observed at opposite B⊥ directions, due to the asymmetric modulation on the exchange field by external B⊥ directions. Our work suggests that the 2D magnetic van der Waals materials and graphene hybrid systems offer a unique platform for quantum Hall ferromagnetism physics.

Plant-based functional food ingredients: zinc, chromium and bilberry polyphenols complexes

This work aimed to develop the technology for the production of functional food ingredients (FFI) with hypoglycemic and hypocholesterolemic action. These are organic forms of zinc and chromium and complex of bilberry polyphenols sorbed on brown buckwheat flour. Soy protein isolate hydrolysate was obtained using pancreatin as an enzymatic agent. The hydrolysis was conducted at 50-52°C for 3 hours. The product was then pasteurized at 75°C for 20 min. Organic forms of zinc and chromium were obtained by mixing the hydrolysate with zinc chloride and chromium chloride water solutions followed by micro- and nanofiltration. The bilberry fruits polyphenols were sorbed on the buckwheat flour by mixing them. The mixture was then centrifuged, the precipitate was lyophilized. Organic sources of zinc and chromium were included in the composition of specialized food product (SFP) for patients with metabolic syndrome (MS) as FFI. The introduction of the product into the hypocaloric diet of MS patients led to improvements in lipid metabolism. In essence, lowered total cholesterol decreased low-density lipoproteins and triglycerides levels, lowered atherogenic coefficient. During in vivo study hypoglycemic properties of FFI (bilberry polyphenols complex with buckwheat flour) were established. Experimental mice had significantly lower glucose, glycated haemoglobin and relative liver weight on the background of FFI consumption. Firstly, the obtained data proves the possibility to extract, concentrate and save beneficial properties of polyphenols through their sorption on the biopolymer plant matrices. Secondly, the obtained data proves the prospects of the use of essential microelements organic forms for preventive diet therapy.

2,4-Dichloro-5-(2,4,6-trimethoxyphenyl)cyclopent-4-ene-1,3-dione derivatives in the reaction with CrCl2

2,4-Dichloro-5-(2,4,6-trimethoxyphenyl)cyclopent-4-ene-1,3-dione derivatives in the reaction with CrCl2

Coexistence of magnetic and electric orderings in a divalent Cr2+-based multiaxial molecular ferroelectric.

Multiferroic materials have attracted great interest because of their underlying new science and promising applications in data storage and mutual control devices. However, they are still very rare and highly imperative to be developed. Here, we report an organic–inorganic hybrid perovskite trimethylchloromethylammonium chromium chloride (TMCM–CrCl3), showing the coexistence of magnetic and electric orderings. It displays a paraelectric–ferroelectric phase transition at 397 K with an Aizu notation of 6/mFm, and spin-canted antiferromagnetic ordering with a Néel temperature of 4.8 K. The ferroelectricity originates from the orientational ordering of TMCM cations, and the magnetism is from the [CrCl3]− framework. Remarkably, TMCM–CrCl3 is the first experimentally confirmed divalent Cr2+-based multiferroic material as far as we know. A new category of hybrid multiferroic materials is pointed out in this work, and more Cr2+-based multiferroic materials will be expectedly developed in the future.

Структурные и электрофизические свойства пленок PbS, легированных Cr-=SUP=-3+-=/SUP=- в процессе химического осаждения

The evolution of the morphology, composition, structural characteristics (lattice constant, microstrains, texturing), optical and photoelectric properties of the PbS films obtained by chemical bath deposition in the presence of ammonium iodide and chromium (III) chloride at a concentration of up to 0.02 M has been studied. According to the elemental analysis by an energy dispersive X-ray spectroscopy, the chromium content in the PbS films has a nonmonotonic dependence on the CrCl3 concentration, and the largest amount is 1.08 at%. The particle size distribution is monomodal, and the average size of the particles forming the films varies from ~ 100 to ~ 225 nm with a content of 2–6% of nanoparticles. The introduction of NH4I and CrCl3 into the reactor preserves the cubic B1 structure of lead sulfide and results in an increase in the band gap Eg by 0.16–0.20 eV, a decrease in the dark resistance Rd, and an increase in the voltage sensitivity Us. The dependences of Eg and Us on the concentration of the chromium salt in the reaction bath have an extreme character with a maximum at 0.016 M, which is associated with the nonmonotonic incorporation of chromium into the PbS lattice. The results of studying the current-voltage characteristics of thin-film PbS(I) and PbS(I, Cr) layers are in good agreement with the results of the structural, optical, and photosensitive properties.

Гибридные органо-неорганические соединения, получаемые методом золь-гель химии из органоалкоксисиланов и металлокомплексов

The paper summarizes information on a narrow class of polycondensed systems known as organic-inorganic hybrid materials, in which particles of metal complexes are embedded in a silicon oxide matrix. There are only one type of particles: coordination compounds of cobalt, chromium, neodymium, erbium, and ytterbium. These materials are prepared by a sol-gel process from molecular precursors that undergo inorganic polymerization called hydrolytic polycondensation. Basic information about the sol-gel processes is presented. The types and properties of the most common sol-gel monomers and oligomers, as well as the methods of obtaining metal-containing gels, are considered, a general idea of the sol-gel processes is described, and the fields of application of the obtained materials are listed. Syntheses of siloxane, carbonate, and carbonate-siloxane cobaltcarbonyl gels are based on the reaction of homomolecular disproportionation of dicobalt octacarbonyl under the action of 3-aminopropyltriethoxysilane, pyridine, and dimethylformamide. A number of organosilicon amine gels have been obtained from 3-aminopropyltriethoxysilane, cobalt(II), chromium(III) chlorides, and triethoxysilane. The sol-gel films containing cobalt, chromium, and neodymium have been obtained from organosilicon amine complexes, their electronic absorption spectra have been measured and interpreted, their transformations during the absorption of oxygen and hydrogen chloride have been shown, and nonlinear optical properties have been measured. Organosilicon amidophosphates are synthesized by the interaction of 3-aminopropyltriethoxysilane with bis(dimethylamido)chlorophosphate and diphenylchlorophosphate. On their basis, complexes of erbium and ytterbium have been obtained, and their absorption and emission spectra have been recorded. Two examples of immobilization of metal complexes on the surface of highly porous polysiloxane hydride and lepidoid siloxene are given.

Toxicity and bioaccumulation of manganese and chromium in different organs of common carp (Cyprinus carpio) fish.

The present research work was carried out to determine the bioaccumulation of manganese and chromium in the gills, intestine, muscles, skin and bones, as well as its acute toxicity and effects on hematological and biochemical parameters in Common carp (Cyprinus carpio). Adult carps were exposed for 96 h to manganese sulphate and chromium chloride solution, a sub lethal concentration was used in the experiment. Bioaccumulation was highest in the gills followed by intestine > muscles > skin > bones. The concentration of hematocrit (HCT) (37.3 ± 0.36), hemoglobin (HGB) (9.0 ± 0.04), Red Blood Cells (RBCs) (3.7 ± 0.025), mean corpuscular volume (MCV) (121.2 ± 0.36), mean corpuscular hemoglobin (MCH) (41.3 ± 0.3) and mean corpuscular hemoglobin concentration (MCHC) (41.06 ± 0.072) was significantly higher at 96 h (P < 0.01) after exposure to manganese and chromium, while the concentration of platelets (PLT) (16.8 ± 0.12) and white blood cells (WBCs) (62.7 ± 0.11) was lower at 96 h of exposure. Serum glutamic pyruvic transaminase (SGPT) (40.6 ± 0.4), Blood Urea (13 ± 0.1), serum triglycerides (231.21 ± 0.04), high-density lipoprotein (HDL) (39 ± 0.07), serum Alkaline PO4 (242 ± 0.2), lactate dehydrogenase (LDH) (1239 ± 13.21), and serum Uric Acid (4.81 ± 0.33) were significantly higher (P < 0.01) at 96 h of exposure. The highest concentration of serum cholesterol (339 ± 0.09), serum reatinine (0.9 ± 0.01), low density lipid (240 ± 0.2) was observed at 24 h. Serum glutamic-oxaloacetic transaminase (SGOT) (19 ± 0.13), and serum albumin were at the highest level at 72 h (3.19 ± 0.07) (P < 0.01) post exposure.

Coplanar cavity for strong coupling between photons and magnons in van der Waals antiferromagnet

We investigate the performance of niobium nitride superconducting coplanar waveguide resonators toward realizing hybrid quantum devices with magnon-photon coupling. We find internal quality factors ∼ 20 000 at 20 mK base temperature, in zero magnetic field. We find that by reducing film thickness below 100 nm, an internal quality factor greater than 1000 can be maintained up to a parallel magnetic field of ∼ 1 T and a perpendicular magnetic field of ∼ 100 mT. We further demonstrate strong coupling of microwave photons in these resonators with magnons in chromium trichloride, a van der Waals antiferromagnet, which shows that these cavities serve as a good platform for studying magnon-photon coupling in 2D magnonics based hybrid quantum systems. We demonstrate strong magnon-photon coupling for both optical and acoustic magnon modes of an antiferromagnet.

Selective synthesis of mono(amidinate) chromium(II) chloride complexes and a computational insight of their interaction with human insulin

Treatment of one equivalent of sterically bulky lithiated amidinate ligands, [RC(NHAr)(NAr)] {R = Ph and Ar = 2,6-diisopropylphenyl (1); R = t-Bu and Ar = 2,6-diisopropylphenyl (2)}, with anhydrous chromium(II) chloride in tetrahydrofuran (THF) afforded, after workup in pentane or hexane, selectively rare examples of mono(amidinate) Cr(II) complexes, [{PhC(NAr)2}Cr(µ-Cl)(thf)]2 (3) and [{t-BuC(NAr)2}Cr(µ-Cl)]2 (4) in 48 and 45% yields, respectively. X-ray analysis shows both 3 and 4 to be dimeric with the amidinate ligands η2-coordinated to one Cr atom each and the Cl ligands bridge the two Cr centers. Owing to the low steric bulk of the amidinate ligand in 3, one thf ligand is coordinated to each Cr atom. A sterically less bulky ligand, [RC(NHAr)(NAr)] {R = t-Bu and Ar = 2,6-dimethylphenyl (5)} instead led to a bis(amidinate) Cr(II) complex (6). A molecular docking simulation of the ligands and metal ligated complexes was performed with the human insulin protein (PDB code: 3Q6E.) to gauge the potential of the metal complexes as effective drug candidates for the treatment of type I and type II diabetes. Docking simulations of the ligands and metal complexes showed a strong binding inside the active site cleft. The docked poses showed important binding features, mostly because of the interactions due to the aromatic moieties of the amidinate ligands.

Unifying Molecular Weights of Highly Linear Polyethylene Waxes through Unsymmetrical 2,4-Bis(imino)pyridylchromium Chlorides.

By dealing CrCl3∙3THF with the corresponding ligands (L1–L5), an array of fluoro-substituted chromium (III) chlorides (Cr1–Cr5) bearing 2-[1-(2,4-dibenzhydryl-6-fluoro- phenylimino)ethyl]-6-[1-(arylimino)ethyl]pyridine (aryl = 2,6-Me2Ph Cr1, 2,6-Et2Ph Cr2, 2,6-iPr2Ph Cr3, 2,4,6-Me3Ph Cr4, 2,6-Et2-4-MePh Cr5) was synthesized in good yield and validated via Fourier Transform Infrared (FT-IR) spectroscopy and elemental analysis. Besides the routine characterizations, the single-crystal X-ray diffraction study revealed the solid-state structures of complexes Cr2 and Cr4 as the distorted-octahedral geometry around the chromium center. Activated by either methylaluminoxane (MAO) or modified methylaluminoxane (MMAO), all the chromium catalysts exhibited high activities toward ethylene polymerization with the MMAO-promoted polymerizations far more productive than with MAO (20.14 × 106 g (PE) mol−1 (Cr) h−1 vs. 10.03 × 106 g (PE) mol−1 (Cr) h−1). In both cases, the resultant polyethylenes were found as highly linear polyethylene waxes with low molecular weights around 1–2 kg mol−1 and narrow molecular weight distribution (MWD range: 1.68–2.25). In general, both the catalytic performance of the ortho-fluorinated chromium complexes and polymer properties have been the subject of a detailed investigation and proved to be highly dependent on the polymerization reaction parameters (including cocatalyst type and amount, reaction temperature, ethylene pressure and run time).

Promising races of baker's yeast for the production of food ingredients enriched with selenium and chromium

It is known, that Saccharomycetes can accumulate mineral substances with targeted enrichment of the growth medium. However, the influence of the genetic affiliation of the culture and the technological factors of yeast strains, the composition of growth media on the efficiency of essential trace elements incorporation into the biomass and on the change of theirs intracellular components content have hardly been investigated. In this regard, the aims of this work was to select promising races of yeast Saccharomyces cerevisiae, develop a biotechnological method for obtaining food ingredients enriched with selenium and chromium on their basis, and study their trace element composition. Material and methods. Industrial strains of baker's yeast (Saccharomyces cerevisiae) were used: RCAM 01137, Y-3439 and Y-581. Yeast were grown on malt wort (pH 4.6) with a dry matter content of 12% with the addition of mineral salts in stationary conditions at a temperature of 30 °C for 18 h, after which the yeast biomass was separated by centrifugation. A method for enriching yeast with trace elements has been selected, which consists in the process of culturing cells on malt growth media containing chromium chloride or selenium dioxide in various concentrations. The total protein content was determined by the Kjeldahl method, polysaccharides and ergosterol - by spectrofluorometric method, selenium - by fluorimetric method. The content of trace elements in yeast biomass enriched with chromium was studied by mass spectrometric method with inductively coupled plasma. Results. It was shown that the highest specific growth rate was demonstrated by the yeast strains RCAM 01137 and Y-3439, and the highest level of maltase activity was in the Y-581 strain. It was found that the amount of biomass after cultivation of the yeast S. cerevisiae RCAM 01137 and Y-3439 was 6.00 и 5.42 g/100 cm3, respectively. It was noted, that the yeast S. cerevisiae Y-581 had capability of high synthesis of ergosterol (1.08±0.04%), the level of which was 2 fold higher than other strains. S. cerevisiae RCAM 01137 yeast showed the greatest ability to selenium enrichment, its content in biomass increased 137 fold and amounted to 2740 μg% when cultivated on a medium containing 800 μg/dm3. S. cerevisiae Y-581 yeast strain showed the highest capability to chromium sorption. The chromium concentration in its biomass was 8340 μg% in case of cultivating on a medium containing 750 μg/dm3. The usage of about 2.7 g of selenium enriched yeast biomass, or 1.0 g chromium enriched one, satisfies the daily requirement for these trace elements. Conclusion. Cultivation of S. cerevisiae cells on growth media containing trace elements makes it possible to obtain yeast biomass samples that can be used to obtain food ingredients for creating food products that contribute to the maintaining human health and improve the quality and duration of life.

Investigating corrosion behavior of Ni and Ni-20Cr in molten ZnCl2

Corrosion of Ni and Ni-20Cr in molten ZnCl2 under argon atmosphere at 593 K was investigated using cyclic polarization in combination with various electron microscopy techniques. Cyclic polarization measurements yielded significantly lower corrosion rates for pure Ni than for Ni-20Cr. Corrosion of the Ni-20Cr alloy is attributed to selective anodic dissolution of Cr, which forms a chromium chloride film at the metal-salt interface. The corrosion in Ni and Ni-20Cr is accelerated by grain boundary attack through intergranular corrosion, followed by the formation of pore-salt network regions. The related corrosion mechanisms and dissolution kinetics are discussed.

Metallographic Documentation of the Degradation of Iron and Nickel Based Alloys in HCl and H&lt;sub&gt;2&lt;/sub&gt;S Containing Environments, between 480 – 680 °C

Corrosion behavior of the alloys 1.7386 (P9), 1.4462, 1.4841, 1.4959 (Alloy 800HT) and 2.4816 (Alloy 600) was tested for 24, 72 and 240 h between 480 – 680 °C. The testing gas atmosphere contained 3.8 vol. % HCl, 200 ppm H2S and CO, CO2 and N2. It simulated conditions present in a thermal cracking process for post-consumer plastics. Samples were analyzed by metallography, SEM/EDX and XRD after corrosion experiments. Additionally, their mass loss during the test was evaluated. A multilayered structure of corrosion products grew on the samples during the corrosion experiments. The composition of the corrosion products depended not on the material, but on the testing temperature. At 680 °C chromium sulphide formed the outer layer, followed by a chromium oxide layer. Below these two layers a chlorine containing layer was observed. At 480 °C mainly nickel sulphide was detected, besides chromium oxide and iron- and chromium chloride. Especially at higher testing temperatures FeCl2 was not observed directly on the samples, but as colorless crystals at the colder parts of the testing equipment. At 680 °C the mass loss of the samples decreased with increasing nickel content. However, this effect changed entirely at lower testing temperatures. At 480 °C 1.7386 and 2.4816 showed nearly the same mass losses.

Comment on: “Novel photoluminescence and optical investigation of poly(vinyl acetate)/polyindole composites synthesized via chromium chloride as oxidant” [Appl. Surf. Sci. 351 (2015) 1140–1145

In the commented paper [Appl. Surf. Sci. 351 (2015) 1140–1145] Bhagat and Dhokane have studied the structural and optical properties of the poly(vinyl acetate)/polyindole composites films. As it is shown in this comment, the refractive index of the samples has been calculated using an incorrect equation and reported values are unreasonable. Also, the optical parameters determined based on the false values of the refractive index such as complex dielectric constant and optical conductivity are incorrect. Besides, the evaluated values of the optical energy band gap are erroneous. Moreover, the reported values for the extinction coefficient are abnormally high and it most likely to be incorrect.

Chromium (III) Oxide Nanostructures Synthesized from Vernonia Amygdalina Leaves Extract

This contribution reports first time synthesis of Cr2O3 nanostructures from chromium (III) chloride hexahydrate precursor using Vernonia amygdalina leaves extract as a reducing and stabilizing agent. Powder X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy techniques were used to study the structural and morphological properties of the as-synthesized Cr2O3 nanostructures. Powder X-ray diffraction patterns spectral analysis showed that hexagonal Cr2O3 nanostructures with an average crystallite size of 23.4 nm were synthesized with the minor appearance of CrO2. SEM images showed that the synthesized nanomaterials are granules. Fourier-transform infrared spectra represent a sharp absorption band at 552 cm-1, which indicates Cr-O-Cr vibrational and stretching modes.

Meron-like topological spin defects in monolayer CrCl3

Noncollinear spin textures in low-dimensional magnetic systems have been studied for decades because of their extraordinary properties and promising applications derived from the chirality and topological nature. However, material realizations of topological spin states are still limited. Employing first-principles and Monte Carlo simulations, we propose that monolayer chromium trichloride (CrCl3) can be a promising candidate for observing the vortex/antivortex type of topological defects, so-called merons. The numbers of vortices and antivortices are found to be the same, maintaining an overall integer topological unit. By perturbing with external magnetic fields, we show the robustness of these meron pairs and reveal a rich phase space to tune the hybridization between the ferromagnetic order and meron-like defects. The signatures of topological excitations under external magnetic field also provide crucial information for experimental justifications. Our study predicts that two-dimensional magnets with weak spin-orbit coupling can be a promising family for realizing meron-like spin textures.

Single or Paired? Structure and Reactivity of PNP-Chromium(II) Hydrides.

The preparation and reactivity of a range of novel paramagnetic chromium(II) complexes supported by a carbazole-based PNP pincer ligand is reported. Deprotonation of the ligand precursors R(PNP)H (1R) and subsequent reaction with chromium(II) chloride led to the formation of square-planar chlorido complexes R(PNP)CrCl (2R). Further reaction with various alkylating agents resulted in the isolation of chromium alkyl complexes R(PNP)CrR' (3R-R') which were then hydrogenated to yield two rare examples of paramagnetic chromium(II) hydrides 4iPr and 4tBu. Both compounds were characterized by X-ray diffraction and paramagnetic NMR spectroscopy supported by a comprehensive DFT-supported assignment of the resonances. While the di(tert-butyl)phosphino PNP substituted complex 4tBu was found to exhibit a monomeric square-planar molecular structure, its isopropyl-substituted analog 4iPr forms a dimer, also indicated by a strong antiferromagnetic coupling of the chromium centers. The pronounced reactivity of these compounds toward C═X double bonds was demonstrated by reaction with benzophenone, N,N'-dicyclohexylcarbodiimide, and carbon dioxide, which gave the corresponding insertion products. The alkoxido complex 5iPr, the amidinato complex 6iPr, and the formato compound 7tBu were also characterized by X-ray diffraction.

Apparent nutrient digestibility of carbohydrate (corn) in Cirrhinus mrigala under the influence of chromium chloride hexahydrate.

A feeding trial was carried out to assess the effect of dietary chromium supplementation on apparent nutrient digestibility coefficient (%) of gelatinized and non-gelatinized corn in Cirrhinus mrigala fingerlings for 90 days. Using various levels of chromium chloride hexahydrate six test diets designated as T1 (G/0.0 Cr2Cl3.6H2O mg Kg-1), T2 (NG/0.0 Cr2Cl3.6H2O mg Kg-1), T3 (G/0.2 Cr2Cl3.6H2O mg Kg-1), T4 (NG/0.2 Cr2Cl3.6H2O mg Kg-1), T5 (G/0.4 Cr2Cl3.6H2O mg Kg-1) and T6 (NG/0.4 Cr2Cl3.6H2O mg Kg-1) were prepared. Results showed highest apparent digestibility coefficient (ADC) of nutrients dry matter, crude lipid and gross energy in test diet T5 that was gelatinized and supplemented with chromium 0.4 mg/Kg while, for crude protein higher value of nutrient digestibility was recorded in T3 test diet (G/0.2 Cr2Cl3.6H2O mg/Kg). It was concluded that chromium supplementation with gelatinized corn in fish (Cirrhinus mrigala) diet can improve the nutrients digestibility more efficiently.