IARC Cancer Review: Group 3 IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 58 ,1993,p. 239.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Animal Limited Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 58 ,1993,p. 239.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Human Inadequate Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 58 ,1993,p. 239.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) . Mercury and its compounds are on the Community Right-To-Know List. EPA Genetic Toxicology Program. Reported in EPA TSCA Inventory. EPA Extremely Hazardous Substances List.

OSHA PEL: CL 0.1 mg(Hg)/m³ (skin)
ACGIH TLV: TWA 0.1 mg(Hg)/m³ (skin); BEI: 35 μg/g creatinine total inorganic mercury in urine preshift; 15 μg/g creatinine total inorganic mercury in blood at end of shift at end of workweek.
NIOSH REL: (Mercury, Aryl and Inorganic) CL 0.1 mg/m³ (skin)
DOT Classification:  6.1; Label: Poison

The Mercury(II) chloride, with the CAS registry number 7487-94-7 and EINECS registry number 231-299-8, is a kind of white crystals. And the molecular formula of this chemical is Cl₂Hg. It is sensitive to moisture, and will decompose by sunlight. What's more, it is soluble in water, and can be stored at room temperature.

The physical properties of Mercury(II) chloride are as following: (1)ACD/LogP: 0.00; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 0; (4)ACD/LogD (pH 7.4): 0; (5)ACD/BCF (pH 5.5): 1; (6)ACD/BCF (pH 7.4): 1; (7)#H bond acceptors: 0; (8)#H bond donors: 0; (9)#Freely Rotating Bonds: 0; (10)Polar Surface Area: 0 Å²; (11)Enthalpy of Vaporization: 16.15 kJ/mol; (12)Boiling Point: °C at 760 mmHg; (13)Vapour Pressure: 33900 mmHg at 25°C.

Preparation of Mercury(II) chloride: It can be obtained by the action of chlorine on mercury or mercury(I) chloride, by the addition of hydrochloric acid to a hot, concentrated solution of mercury(I) compounds such as the nitrate:
HgNO₃ + 2 HCl → HgCl₂ + H₂O + NO₂

Uses of Mercury(II) chloride: It was used in photography, preservation. It was also used in medicine, but because is highly toxic, it is no longer used for medicinal purposes. It is often used as a chemical reagent. What's more, the main application of mercuric chloride is as a catalyst for the conversion of acetylene to vinyl chloride, the precursor to polyvinylchloride:
C₂H₂ + HCl → CH₂=CHCl

You should be cautious while dealing with this chemical. It is toxic to aquatic organisms, and may cause long-term adverse effects in the aquatic environment. It also has danger of serious damage to health by prolonged exposure in contact with skin and if swallowed. What's more, it may cause burns. Therefore, you had better take the following instructions: Wear suitable protective clothing, gloves and eye/face protection, and in case of accident or if you feel unwell, seek medical advice immediately (show label where possible); This material and/or its container must be disposed of as hazardous waste; Avoid release to the environment. Refer to special instructions safety data sheet.

You can still convert the following datas into molecular structure:
(1)SMILES: Cl[Hg]Cl
(2)InChI: InChI=1/2ClH.Hg/h2*1H;/q;;+2/p-2
(3)InChIKey: LWJROJCJINYWOX-NUQVWONBAW

The toxicity data is as follows:

Organism	Test Type	Route	Reported Dose (Normalized Dose)	Effect	Source
dog	LDLo	intravenous	2710ug/kg (2.71mg/kg)		Journal of Pharmacology and Experimental Therapeutics. Vol. 44, Pg. 423, 1932.
dog	LDLo	oral	10mg/kg (10mg/kg)		"Ueber die Wirkung Verschiedener Gifte Auf Vogel, Dissertation," Forchheimer, L., Pharmakologischen Institut der Universitat Wurzburg, Fed. Rep. Ger., 1931Vol. -, Pg. -, 1931.
frog	LD50	intramuscular	7579ug/kg (7.579mg/kg)		Comparative Biochemistry and Physiology, C: Pharmacology, Toxicology and Endocrinology. Vol. 85, Pg. 253, 1986.
frog	LD50	intramuscular	7579ug/kg (7.579mg/kg)		Comparative Biochemistry and Physiology, C: Pharmacology, Toxicology and Endocrinology. Vol. 85, Pg. 253, 1986.
frog	LD50	intramuscular	7579ug/kg (7.579mg/kg)		Comparative Biochemistry and Physiology, C: Pharmacology, Toxicology and Endocrinology. Vol. 85, Pg. 253, 1986.
frog	LDLo	oral	2424mg/kg (2424mg/kg)		"Ueber die Wirkung Verschiedener Gifte Auf Vogel, Dissertation," Forchheimer, L., Pharmakologischen Institut der Universitat Wurzburg, Fed. Rep. Ger., 1931Vol. -, Pg. -, 1931.
frog	LDLo	subcutaneous	2gm/kg (2000mg/kg)		"Ueber die Wirkung Verschiedener Gifte Auf Vogel, Dissertation," Forchheimer, L., Pharmakologischen Institut der Universitat Wurzburg, Fed. Rep. Ger., 1931Vol. -, Pg. -, 1931.
guinea pig	LDLo	intraperitoneal	345mg/kg (345mg/kg)		Archives of Environmental Health. Vol. 11, Pg. 201, 1965.
guinea pig	LDLo	skin	345mg/kg (345mg/kg)		Archives of Environmental Health. Vol. 11, Pg. 201, 1965.
human	LDLo	oral	29mg/kg (29mg/kg)	GASTROINTESTINAL: ULCERATION OR BLEEDING FROM DUODENUM GASTROINTESTINAL: ULCERATION OR BLEEDING FROM LARGE INTESTINE GASTROINTESTINAL: NAUSEA OR VOMITING	New England Journal of Medicine. Vol. 244, Pg. 459, 1951.
man	LDLo	oral	14286ug/kg (14.286mg/kg)	LUNGS, THORAX, OR RESPIRATION: DYSPNEA KIDNEY, URETER, AND BLADDER: URINE VOLUME DECREASED GASTROINTESTINAL: NAUSEA OR VOMITING	Gekkan Yakuji. Pharmaceuticals Monthly. Vol. 41, Pg. 2383, 1999.
man	LDLo	oral	86mg/kg (86mg/kg)	VASCULAR: CHANGE IN PLASMA OR BLOOD VALUME GASTROINTESTINAL: ULCERATION OR BLEEDING FROM STOMACH GASTROINTESTINAL: NECROTIC GHANGES	Journal of Toxicology, Clinical Toxicology. Vol. 26, Pg. 189, 1988.
man	LDLo	oral	143mg/kg (143mg/kg)	BEHAVIORAL: EXCITEMENT KIDNEY, URETER, AND BLADDER: "CHANGES IN TUBULES (INCLUDING ACUTE RENAL FAILURE, ACUTE TUBULAR NECROSIS)" BLOOD: CHANGES IN LEUCOCYTE (WBC) COUNT	Igaku to Seibutsugaku. Medicine and Biology. Vol. 2, Pg. 48, 1942.
man	LDLo	unreported	7253ug/kg (7.253mg/kg)		"Poisoning; Toxicology, Symptoms, Treatments," 2nd ed., Arena, J.M., Springfield, IL, C.C. Thomas, 1970Vol. 2, Pg. 73, 1970.
man	TDLo	oral	21mg/kg (21mg/kg)	GASTROINTESTINAL: OTHER CHANGES KIDNEY, URETER, AND BLADDER: INTERSTITIAL NEPHRITIS KIDNEY, URETER, AND BLADDER: OTHER CHANGES IN URINE COMPOSITION	Clinical Toxicology. Vol. 11, Pg. 309, 1977.
man	TDLo	oral	29mg/kg (29mg/kg)	LUNGS, THORAX, OR RESPIRATION: RESPIRATORY OBSTRUCTION GASTROINTESTINAL: NAUSEA OR VOMITING KIDNEY, URETER, AND BLADDER: URINE VOLUME DECREASED	Medical Journal of Australia. Vol. 2, Pg. 125, 1978.
man	TDLo	oral	57mg/kg (57mg/kg)	GASTROINTESTINAL: GASTRITIS LIVER: LIVER FUNCTION TESTS IMPAIRED KIDNEY, URETER, AND BLADDER: "CHANGES IN TUBULES (INCLUDING ACUTE RENAL FAILURE, ACUTE TUBULAR NECROSIS)"	Japanese Journal of Toxicology. Vol. 8, Pg. 157, 1995.
mouse	LCLo	inhalation	300mg/m3/10M (300mg/m3)		National Defense Research Committee, Office of Scientific Research and Development, Progress Report.Vol. No.9-4-1-9, Pg. 1943,
mouse	LD50	intraperitoneal	3900ug/kg (3.9mg/kg)		Pharmaceutical Chemistry Journal Vol. 25, Pg. 891, 1991.
mouse	LD50	intravenous	4992ug/kg (4.992mg/kg)		Quarterly Journal of Pharmacy & Pharmacology. Vol. 21, Pg. 364, 1948.
mouse	LD50	oral	6mg/kg (6mg/kg)	BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY) BEHAVIORAL: MUSCLE WEAKNESS	Gigiena i Sanitariya. For English translation, see HYSAAV. Vol. 51(1), Pg. 76, 1986.
mouse	LD50	subcutaneous	4500ug/kg (4.5mg/kg)		Nippon Eiseigaku Zasshi. Japanese Journal of Hygiene. Vol. 34, Pg. 193, 1979.
pigeon	LDLo	oral	2200mg/kg (2200mg/kg)		"Abdernalden's Handbuch der Biologischen Arbeitsmethoden." Vol. 4, Pg. 1389, 1935.
pigeon	LDLo	subcutaneous	1100mg/kg (1100mg/kg)		"Abdernalden's Handbuch der Biologischen Arbeitsmethoden." Vol. 4, Pg. 1389, 1935.
quail	LD50	intramuscular	34mg/kg (34mg/kg)	BEHAVIORAL: TREMOR BEHAVIORAL: ATAXIA	Journal of Toxicology and Environmental Health. Vol. 20, Pg. 105, 1987.
quail	LD50	oral	36mg/kg (36mg/kg)	BEHAVIORAL: TREMOR BEHAVIORAL: ATAXIA	Journal of Toxicology and Environmental Health. Vol. 20, Pg. 105, 1987.
rabbit	LD50	intramuscular	7300ug/kg (7.3mg/kg)		Journal of Pharmacology and Experimental Therapeutics. Vol. 87, Pg. 119, 1946.
rabbit	LDLo	intravenous	2mg/kg (2mg/kg)	BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD LUNGS, THORAX, OR RESPIRATION: RESPIRATORY STIMULATION BEHAVIORAL: MUSCLE WEAKNESS	Journal of Pharmacology and Experimental Therapeutics. Vol. 35, Pg. 343, 1929.
rabbit	LDLo	oral	20mg/kg (20mg/kg)		"Ueber die Wirkung Verschiedener Gifte Auf Vogel, Dissertation," Forchheimer, L., Pharmakologischen Institut der Universitat Wurzburg, Fed. Rep. Ger., 1931Vol. -, Pg. -, 1931.
rabbit	LDLo	subcutaneous	10mg/kg (10mg/kg)		Environmental Quality and Safety, Supplement. Vol. 1, Pg. 1, 1975.
rat	LD50	intraperitoneal	3210ug/kg (3.21mg/kg)	KIDNEY, URETER, AND BLADDER: "CHANGES IN TUBULES (INCLUDING ACUTE RENAL FAILURE, ACUTE TUBULAR NECROSIS)"	Proceedings of the European Society for the Study of Drug Toxicity. Vol. 12, Pg. 247, 1971.
rat	LD50	intravenous	1272ug/kg (1.272mg/kg)		Archives of Toxicology. Vol. 58, Pg. 243, 1986.
rat	LD50	oral	1mg/kg (1mg/kg)		Pesticide Manual. Vol. 9, Pg. 550, 1991.
rat	LD50	skin	41mg/kg (41mg/kg)		Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 25(7), Pg. 27, 1981.
rat	LD50	subcutaneous	14mg/kg (14mg/kg)		Japanese Journal of Experimental Medicine. Vol. 39, Pg. 47, 1969.
women	TDLo	oral	18mg/kg (18mg/kg)	KIDNEY, URETER, AND BLADDER: URINE VOLUME DECREASED BLOOD: OTHER CHANGES	Human & Experimental Toxicology. Vol. 11, Pg. 53, 1992.
women	TDLo	oral	50mg/kg (50mg/kg)	GASTROINTESTINAL: NAUSEA OR VOMITING GASTROINTESTINAL: OTHER CHANGES KIDNEY, URETER, AND BLADDER: URINE VOLUME DECREASED	American Journal of Obstetrics and Gynecology. Vol. 80, Pg. 145, 1960.