Eight new complexes were synthesize d for the first time.The compounds which have the general formula K x H 2 [PM(OH 2 )Mo 7 W 2 V 2 O 39 ]·nH 2 O(M=Cr 3+ ,Mn 2+ ,Fe 3+ ,Co 3+ ,Ni 2+ ,Cu 2+ ,Zn 2+ ,Cd 2+ ;x=4or 5...Eight new complexes were synthesize d for the first time.The compounds which have the general formula K x H 2 [PM(OH 2 )Mo 7 W 2 V 2 O 39 ]·nH 2 O(M=Cr 3+ ,Mn 2+ ,Fe 3+ ,Co 3+ ,Ni 2+ ,Cu 2+ ,Zn 2+ ,Cd 2+ ;x=4or 5)were de-termined by conductance titration a nd elemental analysis.The analysis of IR,UV,XRD and ESR show that the products hold the Keggin structure a nd TG-DTA,IR,XRD at various tempera tures and water solubility test also give the evidences that the range of pyrolysis temperature is 300～350℃.T he study on the substitutional reaction of coordinated water by optical ligand quinine shows that the S N 2nucleophilic substitution occure s when Ni is con-tained in the compound and S N 1nucleophilic substitution occure s when Cu is contained.These also con firmed that the transitional metals are in the in ner sphere of the complexes.展开更多
Wells-dawson type heteropolyacid catalyst was prepared by acidification-etherization and characterized by FTIR,over which cyclohexanone ethylene ketal was synthesized from cyclohexanone to ethylene.The experiment resu...Wells-dawson type heteropolyacid catalyst was prepared by acidification-etherization and characterized by FTIR,over which cyclohexanone ethylene ketal was synthesized from cyclohexanone to ethylene.The experiment results showed that the optimal reaction conditions are as follows:the amount of Cyclohexanone is 0.1mol,the molar ratio of Cyclohexanone to ethylene was1.0/1.5(mol/mol),catalyst amount 1.50%(pencent of the reaction stock materials).Through reaction time 2.5h,the yield of cyclohexanone ethylene katal reached over 95.0%.展开更多
文摘Eight new complexes were synthesize d for the first time.The compounds which have the general formula K x H 2 [PM(OH 2 )Mo 7 W 2 V 2 O 39 ]·nH 2 O(M=Cr 3+ ,Mn 2+ ,Fe 3+ ,Co 3+ ,Ni 2+ ,Cu 2+ ,Zn 2+ ,Cd 2+ ;x=4or 5)were de-termined by conductance titration a nd elemental analysis.The analysis of IR,UV,XRD and ESR show that the products hold the Keggin structure a nd TG-DTA,IR,XRD at various tempera tures and water solubility test also give the evidences that the range of pyrolysis temperature is 300～350℃.T he study on the substitutional reaction of coordinated water by optical ligand quinine shows that the S N 2nucleophilic substitution occure s when Ni is con-tained in the compound and S N 1nucleophilic substitution occure s when Cu is contained.These also con firmed that the transitional metals are in the in ner sphere of the complexes.
文摘Wells-dawson type heteropolyacid catalyst was prepared by acidification-etherization and characterized by FTIR,over which cyclohexanone ethylene ketal was synthesized from cyclohexanone to ethylene.The experiment results showed that the optimal reaction conditions are as follows:the amount of Cyclohexanone is 0.1mol,the molar ratio of Cyclohexanone to ethylene was1.0/1.5(mol/mol),catalyst amount 1.50%(pencent of the reaction stock materials).Through reaction time 2.5h,the yield of cyclohexanone ethylene katal reached over 95.0%.
