Recording materials

Claim 2

In recording materials which comprise a support a metal compound, and a ligand compound, at least one of said compounds being provided on said support, said metal compound and said ligand compound being physically separated from one another and capable of forming a colored complex by chemical reaction between the metal compound and the ligand compound upon admixture thereof, the improvement wherein said metal compound comprises an organic phosphorous-iron compound having a bond of PO - and/or PS - with Fe +++ in the molecule and said ligand compound is capable of reacting with the organic phosphorous-iron compound to form a complex.

Claim 3

Recording materials as defined in claim 1 in which one component of the organic phosphorus-iron compounds is at least one of organic phosphorus compounds represented by the following formulae (II) to (XIX) wherein the hydrogen of PO-H or PS-H is substituted with Fe +++ : ##STR15## wherein X is the same or different and represents oxygen atom or sulfur atom and R is the same or different and represents alkyl group or aryl group.

Claim 4

Recording materials as defined in claim 2 in which the group represented by R in the formulae (II) to (XIX) is alkyl group or aryl group unsubstituted or having as a substituent halogen, cyano, hydroxyl, carboxyl, amino, sulfo, substituted or unsubstituted straight-chain or branched-chain alkyl or cycloalkyl, substituted or unsubstituted aryl, substituted or unsubstituted alkoxy, substituted or unsubstituted aryloxy, substituted or unsubstituted alkoxycarbonyl, substituted or unsubstituted aryloxycarbonyl, substituted or unsubstituted acyl or substituted or unsubstituted acylamino, said alkyl group or aryl group containing 4 to 20 carbon atoms except the carbon atoms in the substituent and 4 to 40 carbon atoms including those in the substituent.

Claim 5

Recording materials as defined in claim 2 in which the organic phosphorus-iron compound is a composite iron salt resulting from the reaction between at least one of the compounds of the formulae (II) to (XIX), a ferric salt and at least one of acids represented by the formula ##STR16## wherein R and X are as defined as above and Y represents oxygen atom or sulfur atom.