TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: A metal complex contains metal atom and polymer of cyclic compound as ligand. The metal atom is transition metal atom belonging to period IV-VI of periodic table. Preferred Process: A metal modified metal complex is obtained by modifying metal complex and/or mixture consisting of metal complex, carbon support, and organic compound having boiling point or melting point of 200 degrees C or more, and thermal-polymerization start temperature of 250 degrees C or less by heat processing, radiation irradiation treatment or electrodischarge treatment until carbon-containing rate after modification is 5 mass% or more. The mass percentage reduction of metal complex before and after processing is 1-90 mass%. Preferred Composition: A composition contains metal complex or modified metal complex, carbon support and/or polymer.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): The benzene ring-containing compound (1a) and aldehyde compound of formula: RCHO are reacted in presence of acid, to obtain cyclic compound of formula (Ia).R=H, or optionally substituted (monovalent aromatic group or monovalent hydrocarbon group).Preferred Compound: The cyclic compound (1) is of formula (2). The cyclic compound (2) is of formula (a1 or a2).R1-R6,R16-R18,R20-R24=H or substituent, and R2 may combine with each other to form ring, R3 may combine with each other to form ring, and R4-R6, R16-R18 and R20-R24 may combine with each other to form ring;Q3-Q4=group of formula (a-c);X1=nitrogen or trivalent;andX2=bivalent group such as -O-, -S-, or -NR'-.    TECHNOLOGY FOCUS - POLYMERS - Preferred Compound: A polymer contains residue of cyclic compound (1) as a repeating unit. Preferred Definitions:    P5=atomic group which forms phenol ring system by combining with carbon atom to which Z1 is attached and two carbon atoms adjacent to the carbon atom;    P6=atomic group which forms phenol ring system by combining with carbon atom to which Z2 is attached and two carbon atoms adjacent to the carbon atom;    P1=atomic group which forms nitrogen-containing aromatic heterocycle by combining with Y1 and two carbon atoms adjacent to Y1;    P2=atomic group which forms nitrogen-containing aromatic heterocycle by combining with Y2 and two carbon atoms adjacent to Y2;    P3=atomic group which forms nitrogen-containing aromatic heterocycle by combining with Y3 and two carbon atoms adjacent to Y3;and    P4=atomic group which forms nitrogen-containing aromatic heterocycle by combining with Y4 and two carbon atoms adjacent to Y4.    SPECIFIC COMPOUNDS - 30 cyclic compounds such as 31,32,34,35-tetraazaheptacyclo-pentatriaconta-1(30),2(35),3,5,7,9,11,13,15(33),16,18,20(32),21(31),22,24,26,28-heptadecaene-30,33-diol of formula (I), 30,33,35,36-tetraazaoctacyclo-heptatriaconta-1(29),2,4,6(37),7,9,11,13,15(35),16,18,20(34),21,23,25,27,30,32-octadecaene-34,37-diol, 30,31,33,34-tetraazaheptacyclo-tetratriaconta-1(29),2(34),3,5,7,9,11,13,15(32),16(31),17,19,21,23,25,27-hexadecaene-29,32-diol, 6,20,30,31,33,34-hexaazaheptacyclo-tetratriaconta-1(29),2(34),3,5,7,9,11,13,15(32),16(31),17,19,21,23,25,27-hexadecaene-29,32-diol, and 45,46,48,49-tetraazaundecacyclo-pentaconta-1(45),2(50),3,5,7,9,11,13,15,17(22),18,20,23(48),24(47),25,27,29,31,33,35,37,39(44),40,42-tetracosaene-47,50-diol, are disclosed.    EXAMPLE - 4-Tert-butyl-2-(9-(5-tert-butyl-2-hydroxy-3-(1H-pyrrol-2-yl)phenyl)-1,10-phenanthrolin-2-yl)-6-(1H-pyrrol-2-yl)phenol was dissolved in propionic acid (5 ml). Then, benzaldehyde (0.12) was added to the resulting mixture and heated at 140 degrees C for 7 hours, and purified using silica gel column chromatography, to obtain 4,18-di-tert-butyl-11-phenyl-30,33,35,36-tetraazaoctacyclo-heptatriaconta-1(29),2,4,6(37),7,9,11,13,15(35),16,18,20(34),21,23,25,27,30,32-octadecaene-34,37-diol as macrocyclic compound.