??????????? C??? ??, ??, ??

??? ??

liquid; etches glass slowly at room temp; appreciable vapor pressure at room temp; enthalpy of vaporization 44.52 kJ/mol; enthalpy of fusion 49.96 kJ/mol [CRC10] [MER06]

Synthesis

A small nickel or platinum boat containing VF 4 is placed in a nickel tube and gradually heated to 650°C in a stream of dry N2 . The exit gases are collected in a large-diameter quartz trap maintained at —78°C. The trap is attached to a drying tube with anhydrous KF to exclude atmospheric moisture. The heating process must be effected slowly, since otherwise the unreacted VF4 is blown out of the reaction tube. The product is allowed to cool in a nitrogen stream and the VF5 is discharged directly from the gas trap into a storage container. A greenish-yellowish residue (VF4) remains in the boat. The yield is almost quantitative.

??????????? ?? ?? ? ???

???

?? ??

??????????? ?? ??

???	??	???	??	?? ?	??
Shaanxi Didu New Materials Co. Ltd	+86-89586680; +8617792793228	1069@dideu.com	China	8579	58
Hu Bei Jiutian Bio-medical Technology CO.,Ltd	027-88013699 17354350817	Ryan@jiutian-bio.com	China	5945	58
SUZHOU SENFEIDA CHEMICAL CO.,LTD	+86-0512-83500002 +8618662433356	3899766280@qq.com	China	26362	58
Hunan chemfish Scientific co.,ltd	85567275 15528049369	sales06@chemfish.com	China	4993	58
China Isotope Development Co.,Ltd	17331008322	178069904@qq.com	China	196	58
DWS Specialty Gas Co., Ltd	15906197626	yanning@abamtc.com	China	447	58
Shaanxi DIDU pharmaceutical and Chemical Co., Ltd	029-029-029-81148696 18161915376	1040@dideu.com	China	9999	58
Shanghai Jasper Gas Co., Ltd.	13218776790 13218776790;	13218776790@163.com	China	447	58
Shandong benrite new chemical materials co.,ltd	0533-2866658 15615638350	sales@benritechem.com	China	6942	58
Nanxing Chemical (Jiangsu) Co., Ltd	0512-66387035 18662433356	18662433356@163.com	China	7130	58

??????????? ?? ??: