the present invention will be described in detail below . as described above , the particles of the present invention are obtained by reacting metal complexes of transition metals and ligands containing a nitrogen atom , and polyiodines . the particles are dispersed to form a solution or a film , and then injected or interposed between conductive glass to produce a window which varies the degree of light transmission in the presence of an electric field . the particles of the present invention show physical properties as follows : first of all , the crystal particles show a difference in the degree of light transmission at both axial directions of the crystal particle ; secondly , the particles are uniform in the size and less than 1 μm in dispersion ; thirdly , the dispersed particles are able to remain in a homogeneous and stable whether as a solution or a film , without any modifications caused by light , reactions with other materials , and so on , even if iodine is added in the production procedures . finally , there is an affinity between a dispersion of macromolecules with particular functional groups and the particles , even if the dispersion macromolecules are used for preventing clusteration of the particles . at this time , the particles are the result of reacting complex chemicals and polyiodines . in producing the particles of the present invention , a transition metal atom can be selectively taken among nickel acetate tetrahydrate , cobalt acetate tetrahydrate , copper acetate hydrate and nickel chloride hydrate as a starting material in the synthesis of complex chemicals . picolinic acid can be chosen as a ligand because it contains functional groups of nitrogen atom and carboxylic acid to produce a complex chemical in reaction with transition metal . this ligand and the aforementioned transition metal with oxidation number 2 are sequentially combined into nickel picolate , cobalt picolate and copper picolate . next , polyiodine is synthesized to react with the complex chemicals by reacting an alkali iodide and iodine . at this time , the alkali iodide can be chosen among potassium iodide , calcium iodide , and lithium iodide . the alkali iodide is melt in the solvent mixed with water and ethanol ( 1 : 10 ) and react with iodine at the molar ratio of 1 : 2 . the polyiodine solution obtained in the aforementioned method is mixed with the complex chemicals at the ratio of 1 : 2 . at this time , the mixture turns dark blue . the mixed solution is filtered with a 0 . 2 μm filter . then , the resultant dark blue powder particles are used in the smart window for varying the degree of light transmission in accordance with the present invention . the raman spectrum shows a peak at 143 cm − 1 , revealing the penta - iodine structure of iodine contained in the particles . on the other hand , as in the conventional method of producing windows which vary the degree of light transmission , the particles obtained in the aforementioned method are dispersed in an acrylate based macromolecular resin containing a plasticizer and injected between the conductive glasses . a preferred embodiment of the present invention will be described as a method of producing a smart window . first of all , a plasticizer is melted in the polymer resin , into which the particles are dispersed . to synthesize the polymer resin , tert - butyl acrylate or neo - pentyl alcohol and acrylochloride of acrylate based substances are used to make neopentyl acrylate monomer . then , the resulting polyneopentyl acrylate is used as the dispersion polymer . another preferred embodiment of the dispersion material produced in accordance with the present invention is the polymerization of the interpolymerized material obtained by acrylic acid and ethylmethacrylate . the average molecular weight of the radical - polymerized macromolecules should be about 3 , 000 , 10 , 000 , 15 , 000 , 20 , 000 , 30 , 000 and the dispersity thereof should be between 1 . 7 and 2 . 0 . then , the macromolecules are melted in the solution containing the plasticizer . if polymers with a molecular weight of 3 , 000 or 10 , 000 are left out for a while after dispersion , the precipitation occurs in the solution . on the other hand , if the average molecular weight of the polymers gets larger than 50 , 000 , the dispersion force of the particles decreases . therefore , an optimum average molecular weight of the particles is about 20 , 000 and 30 , 000 . trioxyl trimethylate or butyloctylphthalate can be used as the plasticizer . especially , when the phthalate based plasticizer is mixed with an acrylate based dispersion of macromolecules , the transparency of the solution decreases , causing different rates of light refraction in the particles . if a solution type of chemical substance is used for producing a window which varies the degree of light transmission , an optimum ratio of molecular weight between the dispersion of polymer and plasticizer is 1 : 8 . besides the aforementioned method of synthesizing particles to be dispersed into the dispersion polymers , there is another method of dispersing the complex chemical substance into the dispersion polymers to be reacted with polyiodines . specifically , at first , hydroxy acrylate based polymers are melted in an ether or alcoholic solvent and mixed with the complex chemicals . secondly , the mixture is further mixed with the polyiodine solution and then the chloroform solution is used to remove the polyiodine solution which has not reacted with the complex chemicals . only the particles dispersed into the hydroxy acrylate polymers are made into pastes , which are then dispersed into the ether or alcohol solution to separately collect only a predetermined size of the particle pastes with a centrifugal separation device . then , the particle pastes are dispersed into the dispersion polymers containing the plasticizer . in case that a window is produced using the solution type of particles , an optimum ratio of average molecular weight between the plasticizer and the polymers is about 1 : 8 . the resulting solution is mixed well to form a homogenous solution , injected between the conductive glasses which are tightly sealed to be a final product of the smart window . the present invention is further described in detail with reference to the following embodiments . however , the scope of the present invention is not restricted in the embodiments which will be described below . when nickel acetate tetrahydrate 2 g is heated and melted in ethyl alcohol , and then mixed with picolinic acid 3 g , the color of the mixture turns green to dark blue . then , the mixture is left out for 3 hours or so to form a blue precipitate . the precipitate is separated and dried for analyzing and confirming the composition of elements and chemical structure with nmr and mass spectrometry . the analysis of elements results as follows : c is 48 . 5 %, n 9 . 32 %, h 3 . 23 %. the final molecular weight confirmed in mass analysis is 302 . therefore , it is confirmed in these results that acetate is replaced by picolinic acid , the ligand of nickel . a 5 g metal complex is added to ethylene glycol ethylether 10 g , and polyhydroxyethylmethacrylate ( molecular weight 150 , 000 ) 1 g to be further mixed with a solution obtained by reacting potassium iodide 0 . 16 g and iodine 0 . 5 g in a solvent mixture of ethanol and water in a ratio of 5 : 1 . the polyhydroxyethylmethacrylate is mixed for about 1 hour and made into a paste by means of chloroform . the paste is dispersed into ethyleneglycol ethylether 10 g and rotated by the centrifuge at 3 , 200 rpm for 10 minutes . then , the precipitated portion of the paste is separated to obtain the particles of the present invention . at this time , the chemical structure of polyiodine obtained by reacting polyiodine and metal complex is confirmed with the raman spectroscopy . the spectrum shows a peak at 143 cm − 1 , which indicates that polyiodine consists of 5 iodine atoms . the same method of producing the particles of the present invention as in the first embodiment is applied with the only difference of replacing nickel acetate with cobalt acetate 2 g . the same method of producing the particles of the present invention as in the first embodiment is applied with the only difference being replacing nickel acetate with nickel chloride hydrate 2 g . a dispersion polymer is made by polymerizing acrylic acid and ethyl methacrylate . the polymerized polymer is mixed with a plasticizer , trioxyl trimellitate at the molecular weight ratio of 1 : 10 . the blue paste 2 g produced in embodiment 1 is mixed with 5 g of the dispersion polymer containing the plasticizer . at this time , the dispersion polymer is obtained in a method which will be described as follows : ethyl methacrylate 25 g and acrylic acid 3 g are radical - polymerized by means of aibn 0 . 4 g in a solvent mixture of ethyl acetate and benzene . after a 4 hour reaction , the polymer is precipitated by cyclohexane and filtered and dried in a vacuum oven for the final synthesis of the block copolymer of ethyl methacrylate and acrylic acid , when the average molecular weight is 20 , 000 and the dispersity is 1 . 8 . then , the resultant material is mixed for an hour and injected between two conductive sheets of glass . in order to measure the property of the window produced in the aforementioned method , a uv spectrum is obtained at a range of 400 - 800 nm . the degree of light transmission is measured by the uv spectroscopy , 100 voltage ac power at both electrodes . if power is not applied to the glass , the degree of light transmission measured at wave lengths of 400 - 800 nm is kept in the range of 20 %- 25 % without any distinctive absorption band . when 100 voltage ac power is applied to the glass , the degree of light transmission is increased to 60 %- 65 % without any distinctive absorption peak at wave lengths of 400 - 800 nm . the degree of light transmission can be changed within 1 second in the presence of power . in addition , to check the stability and dispersion of the substance , it is exposed outdoors for 12 months to measure changes in the degree of light transmission . as a result , the difference in the degree of light transmission is kept at about 40 % in cases of the absence and the presence of power . another experiment is carried out in the same way as the first experiment . the only difference is using polyneopentylacrylate with a molecular weight of 25 , 000 as the dispersion polymer ; neopentyl alcohol 20 g and acrylochloride 19 g are reacted in a benzene solvent with the addition of 2 - 3 drops of pyridine . the substance is separated in the 30 minutes evaporization procedure and its structure is determined with nmr . then , the substance is polymerized in tetrahydrofuran for about 5 hours by adding aibn . the solvent is vacuum distilled . as a result , the average molecular weight of the polymer is about 25 , 000 and the dispersity thereof is kept at 1 . 7 - 2 . 0 . when power is not applied to the glass , the degree of light transmission is 20 - 25 % at a range of wave lengths of 400 - 800 nm . when power is applied to the glass , the degree of light transmission increases to 55 - 58 %. when the stability and dispersity of the substance is examined , no difference in the degree of light transmission for a period of 12 months was found . the dispersity of the substance in this experiment proves superior to the block copolymer of acrylic acid and ethylmethacrylate in experiment 1 . the third experiment is carried out in the same way as in experiment 1 . the only difference herein is using polymerized tert - butylacrylate with a molecular weight of 25 , 000 as the dispersion polymer . the difference in the degree of light transmission is kept at about 30 - 35 % in the cases of absence and presence of power . there has been no distinctive difference in the color of particles even if they are left outdoors for a long period of time . as described above , new particles are produced with complex chemical substances to be used for an external decoration material , ie ., window of cars and buildings , to implement light transmission selectivity with the arrangement of dichronic particles in presence of the electric field , to thereby improve transparency of the window , and to change the degree of transmission in the presence of power .