Heat-sensitive recording material

In a heat-sensitive recording material which comprises a substrate and a heat-sensitive recording layer provided thereon, said heat-sensitive recording layer containing a diazo compound and a coupler compound which reacts with said diazo compound to produce color, wherein as the diazo compound, contained is the compound represented by the following general formula (II):

• ##STR102## wherein R.sup.21 to R.sup.24 each independently represents a hydrogen atom, an alkyl group, an aryl group, --OR.sup.25, --SR.sup.26 NR.sup.27 R.sup.28, --COR.sup.30, a halogen atom, --SO.sub.2 R.sup.30, --CN, --NO.sub.2 and at least one of R.sup.21 to R.sup.24 represents any one of an aryloxy group, an arylthio-group and --NR.sup.27 R.sup.28, in which R.sup.25 and R.sup.26 each independently represents a hydrogen atom, an alkyl group, an aryl group or an acyl group, R.sup.27 and R.sup.28 each independently represents a hydrogen atom, an alkyl group, an aryl group, an acyl group, an alkylsulfonyl group or an arylsulfonyl group and R.sup.27 and R.sup.28 are coupled together to form an alkylene group which may contain --O--, --S--, --SO.sub.2 -- or --NR.sup.29, R.sup.29 representing a hydrogen atom, an alkyl group, an aryl group, an acyl group, an alkylsulfonyl group, an arylsulfonyl group, an alkoxycarbonyl group or an aryloxycarbonyl group, and R.sup.30 represents a hydrogen atom, a hydroxyl group, an alkyl group, an aryl group, an alkoxyl group, an aryloxy group or --NR.sup.27 R.sup.28, R.sup.27 and R.sup.28 having the same meanings as defined above;
• C represents --CO-- or --SO.sub.2 --;
• and
• D represents a hydrogen atom, a hydroxyl group, an alkyl group, an aryl group, a heterocyclic group, --COR.sup.31 or --CR.sup.32 NR.sup.33 R.sup.34 in which R.sup.31 represents an alkyl group, an aryl group, an alkoxyl group, an aryloxy group or a heterocyclic group and R.sup.32 represents =O or =S, and R.sup.33 and R.sup.34 each independently represents a hydrogen atom, an alkyl group, an aryl group, an alkylsulfonyl group or an arylsulfonyl group.