A manganese coordination polymer [Mn(3,5-Me2PhCO2)(2)(phen)](n)(phen=1,10-phenanthroline) has been synthesized by hydrothermal methods. The crystal structure was determined by single-crystal X-ray diffraction. The crystal is of triclinic, space group P1 with a=0.7703(4) nm, b=1.1452(6) nm, c=1.5370(9) nm, alpha=78.182(9)degrees, ss= 77.170(9)degrees, gamma=89.784(9)degrees, V=1.2928(12) nm(3), Z=2, M-r=533.47,D-c=1.370g center dot cm(-3), mu=0.549 mm(-1), F(000)=554, R-int= 0.0434, R=0.0608 wR=0.148 4. In the crystal the manganese atom is six-coordinated by two nitrogen atoms from phen and fou...