ORTEP view of (A) the [Re(CO)3(PMG)]2− dianion ([Re-2]2−) and (B) Na2[Re(CO)3(PMG)]•5H2O (Na2[Re-2]•5H2O) with 50% probability for thermal ellipsoids. Selected bond lengths [Å] and angles [°]: Re(1)-N(1) 2.231(2), Re(1)-O(4) 2.154(2), Re(1)-O(6) 2.545(2), Re(1)-C(1) 1.887(3), Re(1)-C(2) 1.904(3), Re(1)-C(3) 1.917(3), C(1)-Re(1)-N(1) 97.59(12), C(2)-Re(1)-N(1) 93.86(12), C(3)-Re(1)-N(1) 174.94(11), C(1)-Re(1)-O(6) 90.48(12), C(2)-Re(1)-O(4) 96.22(12), C(1)-Re(1)-O(4) 171.63(12), C(2)-Re(1)-O(6) 175.51(11), O(4)- Re(1)-N(1) 76.54(9), O(6)-Re(1)-N(1) 81.65(8), O(6)-Re(1)-O(4) 82.81(9), P(1)-C(6)-N(1)-C(4) 85.17, H(4A)-C(4)-N(1)-H(1) 22.09, H(4B)-C(4)-N(1)-H(1) 95.21, H(6A)-C(6)-N(1)-H(1) 77.80, H(6B)-C(6)-N(1)-H(1) 40.43.