▎ 摘　　要

NOVELTY - Polyoxometalates i.e. copper-phosphomolybdate complex ((Cu(L)4)(Cu(L)3(H2O))(Cu(L)(H2O))(P2Mo5O23 )) (I) is new. (I) belongs to the monoclinic crystal system, P2(1)/n space group and the unit cell parameters are: a is 14.7582(12) Angstrom, b is 21.6637(17)Angstrom, c is 16.5156(13)Angstrom, alpha is 90degrees, beta is 110.2860(10)degrees, and gamma is 90degrees. USE - (I) is useful in polyoxometalate-doped graphene oxide composite material for antibacterial aspects (all claimed). ADVANTAGE - The composite material: protects the polyacid molecules from being decomposed under physiological pH conditions; and improves its recycling efficiency and biological efficiency. DETAILED DESCRIPTION - Polyoxometalates i.e. copper-phosphomolybdate complex ((Cu(L)4)(Cu(L)3(H2O))(Cu(L)(H2O))(P2Mo5O23 )) (I) is new. (I) belongs to the monoclinic crystal system, P2(1)/n space group and the unit cell parameters are: a is 14.7582(12) Angstrom, b is 21.6637(17)Angstrom, c is 16.5156(13)Angstrom, alpha is 90degrees, beta is 110.2860(10)degrees, and gamma is 90degrees. L = pyrazole. INDEPENDENT CLAIMS are also included for: 1. preparation of (I); and 2. preparing polyoxometalate doped graphene oxide composite material comprising (i) preparing polyoxometalates, (ii) preparing graphene oxide nanosheet powder, (iii) dissolving 80-100 mg chitosan in 1% acetic acid solution to obtain chitosan solution, dispersing 80-100 mg graphene oxide powder uniformly in 50 ml water to form graphene oxide dispersion, adding graphene oxide dispersion to chitosan solution under stirring and stirring at room temperature for 8-10 hours, then carrying out centrifugation, washing, and vacuum drying to obtain chitosan-modified graphene oxide, and (iv) adding 80-100 mg polyacid compounds into the well-dispersed ethanol solution of chitosan-modified graphene oxide, carrying out continuous sonication at 20-25degrees Celsius for 2-3 hours, and then continuously stirring for 1-2 hours, then carrying out centrifugation, washing and vacuum drying to obtain final product.