Group melting points

Substituents on amino group Melting point, ° C References... 

Therefore, as attractive forces decrease moving down the group, melting point decreases... 

Substituent group Bz-Substituent group Melting point, °C. Refer- ences... 

Element Group Melting point (K) Boiling point (K) Density Oxidation number Electronegativity... 

Name Radical in combination with COOH group Melting Point Boiling Point Specific Gravity... 

PA type Structural formula Density [g cm ] Number ofCH2- groups Melting point [°C] Max. water uptake in % by mass... 

Table 3.1 Crystal structure (space group), melting point crystal density g and color of some transition-metal carbides and nitrides, rs = rocksalt.

Table 4.1 Crystal stmcture (space group), melting point Tm and crystal density g of some metal silisides. or = orthorhombic h = hexagonal c = cubic.

Boiling point nitro-groups Melting point of acid formed Sulphonam... 

The following table shows the atomic numbers of the elements in Group VII of the Period Table and the melting points of their hydrides. 

It is immediately obvious that the transition metals are more dense, harder, and have higher melting points and boiling points than the main group metals (for example, the metals of Group II,... 

Table 14.2 shows that all three elements have remarkably low melting points and boiling points—an indication of the weak metallic bonding, especially notable in mercury. The low heat of atomisation of the latter element compensates to some extent its higher ionisation energies, so that, in practice, all the elements of this group can form cations in aqueous solution or in hydrated salts anhydrous mercuryfll) compounds are generally covalent. 

An extensive series of studies for the prediction of aqueous solubility has been reported in the literature, as summarized by Lipinski et al. [15] and jorgensen and Duffy [16]. These methods can be categorized into three types 1 correlation of solubility with experimentally determined physicochemical properties such as melting point and molecular volume 2) estimation of solubility by group contribution methods and 3) correlation of solubility with descriptors derived from the molecular structure by computational methods. The third approach has been proven to be particularly successful for the prediction of solubility because it does not need experimental descriptors and can therefore be applied to collections of virtual compounds also. 

Reagent A is particularly useful for the treatment of the lower aliphatic aldehydes and ketones which are soluble in water cf. acetaldehyde, p. 342 acetone, p. 346). The Recent is a very dilute solution of the dinitrophenylhydrazine, and therefore is used more to detect the presence of a carbonyl group in a compound than to isolate sufficient of the hydrazone for effective recrystallisation and melting-point determination. 

Sulphonic acids. The aromatic sulphonic acids and their alkali metal salts are soluble in water, but insoluble in ether (Solubility Group II). They are best characterised by conversion into crystalline S-benzyl-iso-thiuronium salts (see Section IV,33,2 and 111,85,5), which possess characteristic melting points. A more time-consuming procedure is to treat the well-dried acid or... 

The bulkiness of the substituent groups increases moving down Table 4.2. Also moving down the table, the melting points decrease, pass through a minimum, and then increase again. As is often the case with reversals of trends such as this, there are two different effects working in opposition in these data ... 

Compoun d Color Melting point, °C Symmetry Space group or stmcture type nm Q, i Q, nm Angle, deg nm Density. g/mL... 

---