(ZA9806323-A)      Transition metal phthalocyanine derivatives of formula (I) are new. M = Ru, Rh, Os, Ir or Pt; X = H, alkyl, alkoxy, OH, optionally substituted aryl, alkylthio, ether, thioether, amino or mono- or di-substituted amino; or adjacent X's may together form -C4H4(Y)n- or ortho-phenylene substituted by (Y)n: Y = alkyl, alkoxy, OH, optionally substituted aryl, alkylthio, ether, thioether, amino or mono- or di-substituted amino; n = 0-4; R, R' = a first bonding ligand (L1) incorporating a functional group which permits bonding to TiO2 or other semiconductor to be sensitised and can conduct an electron from an excited state of the phthalocyanine structure to the conduction band of titanium dioxide or other semiconductor when bonded; or a second ligand (L2) which does not labilise the bond between M and L1; provided that at least 1 of R and R' = L1; Q = N or CZ; Z = H or Y; provided that at least 1 of X, Y and Z is other than H. Also claimed are a dye solar cell in which the dye comprises (I); and an optically transparent device incorporating the cell.    USE -   (I) are useful as photosensitisers for semiconductors in dye solar cells. Compounds which absorb solar radiation in the near infra-red may be used in electricity generating windows. Some metallised phthalocyanines are useful as photosensitisers in the treatment of tumours, but no specific reference is made to the use of (I) for this purpose.    ADVANTAGE -   (I) show significantly improved performance compared with prior art phthalocyanine-type sensitisers. E.g. using a film with (I) grafted to oxide surfaces through axially attached ligands, in a sandwich type cell configuration, in conjunction with a 1M LiI/0.05 M LiI redox electrolyte, photocurrents over 10 mA/cm2 were readily obtained under simulated solar radiation.    (EP998481-A1)      Transition metal phthalocyanine derivatives of formula (I) are new. M = Ru, Rh, Os, Ir or Pt; X = H, alkyl, alkoxy, OH, optionally substituted aryl, alkylthio, ether, thioether, amino or mono- or di-substituted amino; or adjacent X's may together form -C4H4(Y)n- or ortho-phenylene substituted by (Y)n: Y = alkyl, alkoxy, OH, optionally substituted aryl, alkylthio, ether, thioether, amino or mono- or di-substituted amino; n = 0-4; R, R' = a first bonding ligand (L1) incorporating a functional group which permits bonding to TiO2 or other semiconductor to be sensitised and can conduct an electron from an excited state of the phthalocyanine structure to the conduction band of titanium dioxide or other semiconductor when bonded; or a second ligand (L2) which does not labilise the bond between M and L1; provided that at least 1 of R and R' = L1; Q = N or CZ; Z = H or Y; provided that at least 1 of X, Y and Z is other than H. Also claimed are a dye solar cell in which the dye comprises (I); and an optically transparent device incorporating the cell.    USE -   (I) are useful as photosensitisers for semiconductors in dye solar cells. Compounds which absorb solar radiation in the near infra-red may be used in electricity generating windows. Some metallised phthalocyanines are useful as photosensitisers in the treatment of tumours, but no specific reference is made to the use of (I) for this purpose.    ADVANTAGE -   (I) show significantly improved performance compared with prior art phthalocyanine-type sensitisers. E.g. using a film with (I) grafted to oxide surfaces through axially attached ligands, in a sandwich type cell configuration, in conjunction with a 1M LiI/0.05 M LiI redox electrolyte, photocurrents over 10 mA/cm2 were readily obtained under simulated solar radiation.    (JP2001510199-W)      Transition metal phthalocyanine derivatives of formula (I) are new. M = Ru, Rh, Os, Ir or Pt; X = H, alkyl, alkoxy, OH, optionally substituted aryl, alkylthio, ether, thioether, amino or mono- or di-substituted amino; or adjacent X's may together form -C4H4(Y)n- or ortho-phenylene substituted by (Y)n: Y = alkyl, alkoxy, OH, optionally substituted aryl, alkylthio, ether, thioether, amino or mono- or di-substituted amino; n = 0-4; R, R' = a first bonding ligand (L1) incorporating a functional group which permits bonding to TiO2 or other semiconductor to be sensitised and can conduct an electron from an excited state of the phthalocyanine structure to the conduction band of titanium dioxide or other semiconductor when bonded; or a second ligand (L2) which does not labilise the bond between M and L1; provided that at least 1 of R and R' = L1; Q = N or CZ; Z = H or Y; provided that at least 1 of X, Y and Z is other than H. Also claimed are a dye solar cell in which the dye comprises (I); and an optically transparent device incorporating the cell.    USE -   (I) are useful as photosensitisers for semiconductors in dye solar cells. Compounds which absorb solar radiation in the near infra-red may be used in electricity generating windows. Some metallised phthalocyanines are useful as photosensitisers in the treatment of tumours, but no specific reference is made to the use of (I) for this purpose.    ADVANTAGE -   (I) show significantly improved performance compared with prior art phthalocyanine-type sensitisers. E.g. using a film with (I) grafted to oxide surfaces through axially attached ligands, in a sandwich type cell configuration, in conjunction with a 1M LiI/0.05 M LiI redox electrolyte, photocurrents over 10 mA/cm2 were readily obtained under simulated solar radiation.